Lasik eye surgery reviewed by dr. michael duplessie. In much better and more current detail at http://michaelduplessie.com/lasik-surgery-laser-eye-surgery-lasik-cost/
The document summarizes the key steps in a routine LASIK procedure. It describes preparing the patient, exposing the eye, creating a corneal flap using a microkeratome, ablating the corneal tissue with an excimer laser, repositioning the flap, and examining the eye post-operation. The author emphasizes carefully following each step, preparing both eyes, communicating with the patient, and checking for any errors or debris before the patient leaves.
Posterior segment complications of refractive surgeryHind Safwat
This document discusses various posterior segment complications that can occur after refractive eye surgery procedures like LASIK and lens-based refractive surgeries. It describes complications such as retinal detachments, macular hemorrhages, macular holes, choroidal neovascular membranes that have been reported after LASIK. It also discusses complications for lens-based refractive surgeries like perforated globe, suprachoroidal hemorrhage, dropped nucleus, cystoid macular edema, macular phototoxicity, retinal detachment, and endophthalmitis. Risk factors and management strategies for many of these complications are provided. The document concludes with recommendations for refractive surgeons to help prevent or properly manage some of these complications.
The document provides an introduction to refractive surgery. It discusses different vision conditions like myopia, hyperopia and presbyopia. It explains how these conditions can be corrected through glasses, contact lenses or refractive surgery options like LASIK and PRK. It addresses common myths about refractive surgery, discussing the safety, effectiveness and long-term outcomes of these procedures.
Cataracts are clouding of the lens inside the eye that degrade vision over time and are caused by aging and other factors like diabetes, smoking, and UV exposure. There are different types of cataracts but they can usually be removed through a simple outpatient surgery called phacoemulsification where the clouded lens is broken up and removed and replaced with an artificial lens. While cataract surgery is very safe and effective, there are rare risks of complications like infection, swelling, or the need for secondary procedures if the artificial lens does not function properly.
The document summarizes the key steps in a routine LASIK procedure. It describes preparing the patient, exposing the eye, creating a corneal flap using a microkeratome, ablating the corneal tissue with an excimer laser, repositioning the flap, and examining the eye post-operation. The author emphasizes carefully following each step, preparing both eyes, communicating with the patient, and checking for any errors or debris before the patient leaves.
Posterior segment complications of refractive surgeryHind Safwat
This document discusses various posterior segment complications that can occur after refractive eye surgery procedures like LASIK and lens-based refractive surgeries. It describes complications such as retinal detachments, macular hemorrhages, macular holes, choroidal neovascular membranes that have been reported after LASIK. It also discusses complications for lens-based refractive surgeries like perforated globe, suprachoroidal hemorrhage, dropped nucleus, cystoid macular edema, macular phototoxicity, retinal detachment, and endophthalmitis. Risk factors and management strategies for many of these complications are provided. The document concludes with recommendations for refractive surgeons to help prevent or properly manage some of these complications.
The document provides an introduction to refractive surgery. It discusses different vision conditions like myopia, hyperopia and presbyopia. It explains how these conditions can be corrected through glasses, contact lenses or refractive surgery options like LASIK and PRK. It addresses common myths about refractive surgery, discussing the safety, effectiveness and long-term outcomes of these procedures.
Cataracts are clouding of the lens inside the eye that degrade vision over time and are caused by aging and other factors like diabetes, smoking, and UV exposure. There are different types of cataracts but they can usually be removed through a simple outpatient surgery called phacoemulsification where the clouded lens is broken up and removed and replaced with an artificial lens. While cataract surgery is very safe and effective, there are rare risks of complications like infection, swelling, or the need for secondary procedures if the artificial lens does not function properly.
Focus Co Management Session - Dr. Menard April 2015 FocusEye
This document summarizes Dr. Claude Ménard's presentation at the ASCRS 2015 conference. It discusses dysfunctional lens syndrome, where the lens has internal aberrations but no opacities, making the patient a candidate for lens removal rather than corneal refractive surgery. It also discusses femtosecond laser cataract surgery and how it provides a better capsulorhexis and docking system but no better results so far. New IOLs discussed include low add multifocals for intermediate vision, and the Symfony IOL which provides extended depth of field and chromatic correction without halos by adding 1.5 diopters. A study on monovision showed modest monovision of -1.25
The document discusses refractive surgeries and provides details on LASIK (Laser-Assisted In Situ Keratomileusis) specifically. It summarizes that LASIK combines lamellar corneal surgery using a microkeratome to create a corneal flap with excimer laser ablation of corneal stroma beneath the flap. The procedure involves creating a corneal flap using a microkeratome, ablating the stroma with an excimer laser according to a calculated profile, and repositioning the flap. Complications are minimized as the flap protects underlying tissues from the laser.
This document discusses various refractive surgery procedures used to correct refractive errors of the eye, including incisional keratotomy techniques, lamellar procedures, laser ablation procedures, corneal implants, and lens-based procedures. It provides details on common procedures like radial keratotomy, LASIK, PRK, and LASEK. It covers patient evaluation, surgical techniques, potential complications, and advantages of different approaches. Wavefront-guided customized excimer laser surgery is also introduced to correct higher-order aberrations in addition to spherical and cylindrical errors.
This document provides an overview of retinal detachment through a self-directed learning package. It begins with learning outcomes, then covers the epidemiology, anatomy of the eye and retina, and the three main types of retinal detachment (rhegmatogenous, tractional, exudative). Symptoms include flashes of light, floaters, visual field defects, and falling visual acuity. Diagnosis involves examining these symptoms, checking for a relative afferent pupillary defect, measuring intraocular pressure, and performing dilated fundoscopy to look for signs of detachment. Treatment options are also discussed.
The document provides an introduction to refractive surgery, describing different types of refractive errors and methods used to correct them. It discusses procedures like LASIK, PRK, and lens implants. LASIK involves creating a corneal flap then sculpting the cornea with an excimer laser. PRK removes the outer corneal layer then applies the laser. Lens implants are for higher refractive errors or when other methods don't work. The risks, recovery times, and potential outcomes are outlined for each procedure.
- A cataract is a clouding of the lens in the eye that can cause vision loss. It is often related to aging but may be caused by other factors like smoking.
- Symptoms include decreased vision, glare from lights, and frequent changes to prescriptions. Cataract surgery is usually done to replace the cloudy lens with an artificial lens implant.
- There are different types of intraocular lenses that provide varying levels of vision correction and independence from glasses after surgery. Conventional lenses correct one distance while newer lenses aim to provide multifocal vision.
Zonular cataract is one of the predominant congenital cataract. In this presentation we see its definition, pathology, risk factors, causes, signs and symptoms, diagnosis, treatment, prognosis. A cataract is an opacification of the lens. Congenital cataracts are also the most frequent cause of leukocoria (white pupil) in children
This document summarizes a presentation on dysphotopsia, or unwanted visual images, following cataract surgery. The key points are:
- Dysphotopsia is a common complaint following uncomplicated cataract surgery, with 1 in 10 patients experiencing symptoms. Negative dysphotopsia, involving a dark shadow, is most prevalent.
- Factors influencing dysphotopsia include intraocular lens (IOL) edge design, material, and coverage of the anterior capsule. Newer IOL designs have reduced symptoms by minimizing light scattering and reflections.
- Managing patient expectations before surgery and using techniques like overlapping the capsulorhexis rim over the IOL edge can help reduce dys
2013 Co-Management Management of complications Dr. MalikFocusOttawa
SBK Intralase complications can be divided into three categories: flap, interface, and biomechanical. The most common complication is diffuse lamellar keratitis (DLK), a sterile inflammatory reaction that develops within 48 hours and is treated with topical steroids. Epithelial ingrowth involves the presence of corneal epithelium in the interface and is treated by lifting and scraping the flap. Dry eye is another common complication caused by surgical destruction of nerve endings, but most cases resolve within three months with treatment. Managing complications early and accurately is key to achieving good visual outcomes.
This is a video about eye laser treatment, particularly LASIK. It was made to inform you about the procedure as well as what to look for when choosing clinics and doctors.
Watch the video and learn all the vital information about this life-changing treatment in 4 minutes!
Retinal detachment is a serious condition where the retina peels away from its underlying supportive tissue layer. It can cause permanent vision loss if not repaired soon. The summary examines the risk factors, types, signs and symptoms, diagnosis, and treatment options for retinal detachment. Surgical methods like scleral buckling, cryopexy, laser photocoagulation, pneumatic retinopexy and vitrectomy aim to reattach the retina. Prompt treatment usually leads to vision improvement, though the prognosis depends on factors like macula involvement and presence of proliferative vitreoretinopathy. Post-operative care and home management are important to monitor for complications and aid recovery.
Case presentation-congenital & developmental cataractSivarathana
This document summarizes the case presentation of a 15-year-old female student who underwent cataract surgery in her right eye 2 years ago. Her previous prescription showed mild hyperopia and astigmatism. On examination, her best corrected vision was 6/6 and her refraction showed mild residual hyperopia and astigmatism. She was diagnosed with pseudophakia and prescribed bifocal glasses. The document then provides background information on different types of cataracts, their causes, signs, symptoms, management including surgery and optical correction options.
Extracapsular cataract surgery involves removing the clouded lens and surrounding capsule from the eye. The most common method is phacoemulsification, which uses ultrasound to break up the lens for removal through a small incision. After removal of the cataract, an intraocular lens implant is typically placed. Surgery is usually quick and has a high success rate in improving vision, but risks include infection, swelling, bleeding or complications that may require further treatment.
This document provides information on managing pediatric cataracts. It discusses that childhood cataracts are a major cause of blindness worldwide and disrupt visual development. Timely cataract removal and rehabilitation is important. Examination of pediatric cataract patients involves assessing visual acuity, eye alignment and function. Surgical techniques aim to remove the cataract while preserving the capsular bag for intraocular lens implantation. Post-operative care and amblyopia management are crucial to optimize visual outcomes. Complications include inflammation, glaucoma, posterior capsule opacification and membrane formation.
Phototherapeutic keratectomy By Dr. Safaa Refaatsafaa refaat
PTK uses an excimer laser to treat superficial corneal opacities and improve vision. The document discusses the technique of PTK, including epithelial debridement, stromal ablation depth based on indication, and masking. Complications can include pain, delayed healing, haze, glare and hyperopic shift. A study of 10 eyes found PTK safely and effectively improved vision in patients with central or para central opacities limited to the anterior stroma. All eyes but one showed improved vision, with a statistically significant gain in mean BCVA. Epithelial healing was complete within 72 hours. Most eyes experienced a hyperopic shift, though the change in refractive error was insignificant.
This document discusses retinal detachment, including its causes, symptoms, diagnosis, and treatment options. The retina is the light-sensitive layer of tissue in the back of the eye. Retinal detachment occurs when the retina separates from its underlying layer, and fluid accumulates underneath. Common causes are trauma, advanced diabetes, high nearsightedness, and vitreous shrinkage. Symptoms include floaters, light flashes, and blurred or lost vision. Treatment options aim to reattach the retina through procedures like laser photocoagulation, cryopexy, pneumatic retinopexy, scleral buckling, or vitrectomy surgery.
Secondary cataract, also known as after-cataract, is an opacification of the posterior capsule of the lens that may develop months or years after cataract extraction surgery. It occurs when epithelial cells proliferate behind the new lens capsule, preventing light from reaching the retina and causing vision loss. Up to 20% of patients who undergo cataract extraction may develop secondary cataract, especially younger patients. Symptoms include decreased visual acuity and blurry vision. The standard treatment is Nd:YAG laser capsulotomy to cut an opening in the opaque capsule and restore vision, though there are small risks like increased eye pressure or retinal detachment.
This document provides information on the management of cataracts, including both non-surgical and surgical approaches. Non-surgical management focuses on controlling underlying causes, delaying progression, and improving vision. Surgical management involves extracting the opaque lens using various techniques like intracapsular cataract extraction (ICCE), extracapsular cataract extraction (ECCE), or phacoemulsification. Pre-operative evaluation is important to assess retinal function and rule out infections. Intraocular lenses are then implanted to restore vision.
Seminar 1 ophthal refractive error and cataractMohd Hanafi
This document provides information on refractive errors, cataracts, and their treatment. It discusses the types of refractive errors including emmetropia, myopia, hypermetropia, and presbyopia. It describes what causes cataracts, the different types including senile and diabetic cataracts, and symptoms and signs. Treatment options covered include temporary management techniques as well as definitive surgical options like extracapsular cataract extraction and phacoemulsification. Potential complications of cataract surgery and their management are also outlined.
Good to know, since we are likely to get cataract sooner or later.
Take care of your precious eyes before cataract starts to form.
Watch this power point presentation.
Daniele Tosi - OFSRC presentation at Jiliang UniversityDaniele Tosi
This document summarizes optical fiber sensor research activities at the University of Limerick for medical applications. The research center develops various optical fiber sensor technologies including EFPI, FBG, and LPG sensors for minimally invasive pressure, temperature, and strain monitoring. These sensors have applications in cardiovascular monitoring, urodynamics, robotic surgery, and radiofrequency ablation. Partnerships with medical centers help translate the fiber sensor technologies to solutions for fractional flow reserve measurement, ventricular assist devices, and bladder outlet obstruction diagnosis.
Focus Co Management Session - Dr. Menard April 2015 FocusEye
This document summarizes Dr. Claude Ménard's presentation at the ASCRS 2015 conference. It discusses dysfunctional lens syndrome, where the lens has internal aberrations but no opacities, making the patient a candidate for lens removal rather than corneal refractive surgery. It also discusses femtosecond laser cataract surgery and how it provides a better capsulorhexis and docking system but no better results so far. New IOLs discussed include low add multifocals for intermediate vision, and the Symfony IOL which provides extended depth of field and chromatic correction without halos by adding 1.5 diopters. A study on monovision showed modest monovision of -1.25
The document discusses refractive surgeries and provides details on LASIK (Laser-Assisted In Situ Keratomileusis) specifically. It summarizes that LASIK combines lamellar corneal surgery using a microkeratome to create a corneal flap with excimer laser ablation of corneal stroma beneath the flap. The procedure involves creating a corneal flap using a microkeratome, ablating the stroma with an excimer laser according to a calculated profile, and repositioning the flap. Complications are minimized as the flap protects underlying tissues from the laser.
This document discusses various refractive surgery procedures used to correct refractive errors of the eye, including incisional keratotomy techniques, lamellar procedures, laser ablation procedures, corneal implants, and lens-based procedures. It provides details on common procedures like radial keratotomy, LASIK, PRK, and LASEK. It covers patient evaluation, surgical techniques, potential complications, and advantages of different approaches. Wavefront-guided customized excimer laser surgery is also introduced to correct higher-order aberrations in addition to spherical and cylindrical errors.
This document provides an overview of retinal detachment through a self-directed learning package. It begins with learning outcomes, then covers the epidemiology, anatomy of the eye and retina, and the three main types of retinal detachment (rhegmatogenous, tractional, exudative). Symptoms include flashes of light, floaters, visual field defects, and falling visual acuity. Diagnosis involves examining these symptoms, checking for a relative afferent pupillary defect, measuring intraocular pressure, and performing dilated fundoscopy to look for signs of detachment. Treatment options are also discussed.
The document provides an introduction to refractive surgery, describing different types of refractive errors and methods used to correct them. It discusses procedures like LASIK, PRK, and lens implants. LASIK involves creating a corneal flap then sculpting the cornea with an excimer laser. PRK removes the outer corneal layer then applies the laser. Lens implants are for higher refractive errors or when other methods don't work. The risks, recovery times, and potential outcomes are outlined for each procedure.
- A cataract is a clouding of the lens in the eye that can cause vision loss. It is often related to aging but may be caused by other factors like smoking.
- Symptoms include decreased vision, glare from lights, and frequent changes to prescriptions. Cataract surgery is usually done to replace the cloudy lens with an artificial lens implant.
- There are different types of intraocular lenses that provide varying levels of vision correction and independence from glasses after surgery. Conventional lenses correct one distance while newer lenses aim to provide multifocal vision.
Zonular cataract is one of the predominant congenital cataract. In this presentation we see its definition, pathology, risk factors, causes, signs and symptoms, diagnosis, treatment, prognosis. A cataract is an opacification of the lens. Congenital cataracts are also the most frequent cause of leukocoria (white pupil) in children
This document summarizes a presentation on dysphotopsia, or unwanted visual images, following cataract surgery. The key points are:
- Dysphotopsia is a common complaint following uncomplicated cataract surgery, with 1 in 10 patients experiencing symptoms. Negative dysphotopsia, involving a dark shadow, is most prevalent.
- Factors influencing dysphotopsia include intraocular lens (IOL) edge design, material, and coverage of the anterior capsule. Newer IOL designs have reduced symptoms by minimizing light scattering and reflections.
- Managing patient expectations before surgery and using techniques like overlapping the capsulorhexis rim over the IOL edge can help reduce dys
2013 Co-Management Management of complications Dr. MalikFocusOttawa
SBK Intralase complications can be divided into three categories: flap, interface, and biomechanical. The most common complication is diffuse lamellar keratitis (DLK), a sterile inflammatory reaction that develops within 48 hours and is treated with topical steroids. Epithelial ingrowth involves the presence of corneal epithelium in the interface and is treated by lifting and scraping the flap. Dry eye is another common complication caused by surgical destruction of nerve endings, but most cases resolve within three months with treatment. Managing complications early and accurately is key to achieving good visual outcomes.
This is a video about eye laser treatment, particularly LASIK. It was made to inform you about the procedure as well as what to look for when choosing clinics and doctors.
Watch the video and learn all the vital information about this life-changing treatment in 4 minutes!
Retinal detachment is a serious condition where the retina peels away from its underlying supportive tissue layer. It can cause permanent vision loss if not repaired soon. The summary examines the risk factors, types, signs and symptoms, diagnosis, and treatment options for retinal detachment. Surgical methods like scleral buckling, cryopexy, laser photocoagulation, pneumatic retinopexy and vitrectomy aim to reattach the retina. Prompt treatment usually leads to vision improvement, though the prognosis depends on factors like macula involvement and presence of proliferative vitreoretinopathy. Post-operative care and home management are important to monitor for complications and aid recovery.
Case presentation-congenital & developmental cataractSivarathana
This document summarizes the case presentation of a 15-year-old female student who underwent cataract surgery in her right eye 2 years ago. Her previous prescription showed mild hyperopia and astigmatism. On examination, her best corrected vision was 6/6 and her refraction showed mild residual hyperopia and astigmatism. She was diagnosed with pseudophakia and prescribed bifocal glasses. The document then provides background information on different types of cataracts, their causes, signs, symptoms, management including surgery and optical correction options.
Extracapsular cataract surgery involves removing the clouded lens and surrounding capsule from the eye. The most common method is phacoemulsification, which uses ultrasound to break up the lens for removal through a small incision. After removal of the cataract, an intraocular lens implant is typically placed. Surgery is usually quick and has a high success rate in improving vision, but risks include infection, swelling, bleeding or complications that may require further treatment.
This document provides information on managing pediatric cataracts. It discusses that childhood cataracts are a major cause of blindness worldwide and disrupt visual development. Timely cataract removal and rehabilitation is important. Examination of pediatric cataract patients involves assessing visual acuity, eye alignment and function. Surgical techniques aim to remove the cataract while preserving the capsular bag for intraocular lens implantation. Post-operative care and amblyopia management are crucial to optimize visual outcomes. Complications include inflammation, glaucoma, posterior capsule opacification and membrane formation.
Phototherapeutic keratectomy By Dr. Safaa Refaatsafaa refaat
PTK uses an excimer laser to treat superficial corneal opacities and improve vision. The document discusses the technique of PTK, including epithelial debridement, stromal ablation depth based on indication, and masking. Complications can include pain, delayed healing, haze, glare and hyperopic shift. A study of 10 eyes found PTK safely and effectively improved vision in patients with central or para central opacities limited to the anterior stroma. All eyes but one showed improved vision, with a statistically significant gain in mean BCVA. Epithelial healing was complete within 72 hours. Most eyes experienced a hyperopic shift, though the change in refractive error was insignificant.
This document discusses retinal detachment, including its causes, symptoms, diagnosis, and treatment options. The retina is the light-sensitive layer of tissue in the back of the eye. Retinal detachment occurs when the retina separates from its underlying layer, and fluid accumulates underneath. Common causes are trauma, advanced diabetes, high nearsightedness, and vitreous shrinkage. Symptoms include floaters, light flashes, and blurred or lost vision. Treatment options aim to reattach the retina through procedures like laser photocoagulation, cryopexy, pneumatic retinopexy, scleral buckling, or vitrectomy surgery.
Secondary cataract, also known as after-cataract, is an opacification of the posterior capsule of the lens that may develop months or years after cataract extraction surgery. It occurs when epithelial cells proliferate behind the new lens capsule, preventing light from reaching the retina and causing vision loss. Up to 20% of patients who undergo cataract extraction may develop secondary cataract, especially younger patients. Symptoms include decreased visual acuity and blurry vision. The standard treatment is Nd:YAG laser capsulotomy to cut an opening in the opaque capsule and restore vision, though there are small risks like increased eye pressure or retinal detachment.
This document provides information on the management of cataracts, including both non-surgical and surgical approaches. Non-surgical management focuses on controlling underlying causes, delaying progression, and improving vision. Surgical management involves extracting the opaque lens using various techniques like intracapsular cataract extraction (ICCE), extracapsular cataract extraction (ECCE), or phacoemulsification. Pre-operative evaluation is important to assess retinal function and rule out infections. Intraocular lenses are then implanted to restore vision.
Seminar 1 ophthal refractive error and cataractMohd Hanafi
This document provides information on refractive errors, cataracts, and their treatment. It discusses the types of refractive errors including emmetropia, myopia, hypermetropia, and presbyopia. It describes what causes cataracts, the different types including senile and diabetic cataracts, and symptoms and signs. Treatment options covered include temporary management techniques as well as definitive surgical options like extracapsular cataract extraction and phacoemulsification. Potential complications of cataract surgery and their management are also outlined.
Good to know, since we are likely to get cataract sooner or later.
Take care of your precious eyes before cataract starts to form.
Watch this power point presentation.
Daniele Tosi - OFSRC presentation at Jiliang UniversityDaniele Tosi
This document summarizes optical fiber sensor research activities at the University of Limerick for medical applications. The research center develops various optical fiber sensor technologies including EFPI, FBG, and LPG sensors for minimally invasive pressure, temperature, and strain monitoring. These sensors have applications in cardiovascular monitoring, urodynamics, robotic surgery, and radiofrequency ablation. Partnerships with medical centers help translate the fiber sensor technologies to solutions for fractional flow reserve measurement, ventricular assist devices, and bladder outlet obstruction diagnosis.
LASIK is a laser eye surgery procedure that can permanently correct vision problems like nearsightedness, farsightedness and astigmatism. It involves using a laser to reshape the cornea to improve vision and eliminate the need for glasses or contacts. To be eligible for LASIK, a person must be at least 18 years old and have stable vision for at least a year. An eye exam will determine if a person's eyes and corneal thickness make them a suitable candidate for the procedure. If eligible, LASIK only takes a few minutes per eye and most people can return to regular activities within a day or two with a high success rate and minimal risks.
El documento resume los principales factores del mercado que afectan a una empresa salinera venezolana, incluyendo la competencia de otras marcas de sal, varios tipos de clientes, factores económicos como la inflación, y varios organismos regulatorios como SUNAGRO, SENIAT y leyes laborales. También describe factores internos como la delegación de tareas, comunicación, donaciones benéficas y el uso de tecnología como SAP y correo electrónico.
Cosas que debes saber de la gastronomíaMiguel Tagle
Este documento ofrece consejos sobre la gastronomía. Recomienda nunca quedarse quieto y mantener limpio el área de trabajo. Además, enfatiza la importancia de estudiar mucho sobre historia de los ingredientes y técnicas de cocción. Finalmente, destaca que la gastronomía requiere dedicación y conocimientos sobre higiene y seguridad alimentaria.
La Primera Guerra Mundial estalló debido a varios factores como el intenso nacionalismo en Europa, la rivalidad económica y política entre las naciones, y la carrera armamentística. El asesinato del archiduque Francisco Fernando de Austria-Hungría en Sarajevo fue la causa inmediata. Las consecuencias incluyeron la desaparición de los imperios de Austria-Hungría y el Imperio Otomano, y el surgimiento de Estados Unidos como gran potencia mundial.
Michael Duplessie Eye Department, Eye surgery and eye careMichael Duplessie
This document discusses various eye conditions and treatments. It covers reasons for eye exams, common eye diseases like glaucoma and cataracts. It also discusses various surgical procedures like cataract surgery, corneal transplants, and presbyopia correcting lenses. Laser vision correction techniques like LASIK, SMILE, and lens implants are explained. Conditions like keratoconus and corneal scarring are mentioned.
El documento describe el debate entre Fray Bartolomé de las Casas y Juan Ginés de Sepúlveda sobre la esclavitud indígena en América. De las Casas se opuso a la esclavitud indígena y defendió los derechos de los indígenas, mientras que Sepúlveda argumentó que la esclavitud estaba justificada porque los indígenas eran inferiores y necesitaban ser gobernados por los españoles. Finalmente, los teólogos apoyaron a De las Casas y condenaron la encomienda,
Hydrogen sulphide as a gasotransmitter loadingsoorajben10
1. Hydrogen sulfide (H2S) exists in an ionized form as HS- and as "bound sulfur" incorporated into proteins.
2. H2S signaling occurs through protein sulfhydration, the addition of sulfur to cysteine residues, altering protein function. This is more prevalent than nitric oxide protein nitrosylation.
3. H2S relaxes blood vessels by opening ATP-sensitive potassium channels on endothelial cells via channel sulfhydration, causing hyperpolarization.
This document provides an overview of professionally applied topical fluorides for caries prevention. It defines topical fluoride therapy as using high concentrations of fluoride applied locally to tooth surfaces. Common forms discussed include sodium fluoride, stannous fluoride, acidulated phosphate fluoride, and fluoride varnish. Application techniques and mechanisms of action are described for each. Effectiveness is supported by several clinical studies showing reductions in caries increment ranging from 30-66% with topical fluoride use. Contraindications and advantages/disadvantages of each product are also summarized.
The document discusses various diseases of the cornea, eyelids, conjunctiva, and lacrimal system. It provides descriptions of common conditions such as meibomian gland dysfunction, blepharitis, hordeolum, chalazion, pinguecula, pterygium, and dry eye. It also covers rarer infectious diseases caused by bacteria, viruses, and parasites like trachoma. Treatment options are mentioned for select disorders. The document serves as an overview of external eye diseases for physicians.
9 Criteria For A Good LASIK CandidateBy Brian S. Boxer Wachler, .docxransayo
9 Criteria For A Good LASIK Candidate
By Brian S. Boxer Wachler, MD
A successful LASIK procedure is determined largely by whether you meet certain patient criteria and if laser eye surgery is right for you.
LASIK and PRK outcomes are almost always favorable; however, not everyone is a good candidate for vision correction surgery.
The following laser eye surgery checklist is a good start to help you determine if LASIK or PRK is right for you.
1. Your Eyes Must Be Healthy
If you have any condition that can affect how your eyes respond to surgery or heal afterwards, you must wait until that condition is resolved. Examples are severe dry eye syndrome, conjunctivitis(pink eye), infection and any type of eye injury.
If you have persistent dry eyes, where you do not produce enough tears to keep your eyes lubricated and healthy, LASIK surgery may aggravate this condition. Common symptoms of dry eyes include burning or stinging, a gritty sensation in the eye, reduced tolerance to wind, intermittent blurry vision, and even excessive tears in some cases. If you have some of these symptoms, be sure to discuss them with your doctor prior to surgery.
Your eye doctor can determine if you have dry eyes during your preoperative exam and usually can successfully treat the condition so you can then proceed with laser eye surgery. Possible treatments include artificial tears, punctal plugs, medicated eye drops, flaxseed or fish oil supplements, or a combination of these approaches.
Cataracts that interfere with your vision and uncontrolled glaucoma also will typically prevent you from being a candidate for LASIK or PRK procedures.
2. Your Cornea Must Have Sufficient Thickness
Most refractive procedures improve visual acuity by reshaping the front surface of the eye (cornea). Performing laser eye surgery on a cornea that is too thin or has a surface that is extremely irregular and misshapen (for example, if you suffer from keratoconus) could compromise results and impair your vision.
If you've been told in the past that you couldn't have LASIK because your corneas are too thin, recent advances may mean you're now an acceptable candidate for laser vision correction. For example, using a femtosecond laser instead of a microkeratome may enable your surgeon to make a thinner corneal flap and thereby preserve more underlying corneal tissue for laser treatment.
And, if you're still not a good candidate for LASIK or PRK despite new technologies and techniques, another type of refractive surgery, such as implantable lenses (phakic IOLs), may be an option.
3. Your Pupils Must Not Be Overly Large
If your pupils are naturally large, you could be at increased risk of side effects such as halos, glares and starbursts in low light, especially when driving at night.
4. Your Prescription Must Be Within Certain Limits
If your prescription is very high — whether due to nearsightedness, farsightedness or astigmatism— your eye surgeon may advise you against the LASIK procedure.
Resu.
Although optometrists do not perform laser vision correction here in the United States, they can still provide a valuable role in this procedure that is gaining unprecedented popularity.
Optometry's Role in Laser Vision Correctioncoakleylincoln
Although optometrists do not perform laser vision correction here in the United States, they can still provide a valuable role in this procedure that is gaining unprecedented popularity.
Although optometrists do not perform laser vision correction here in the United States, they can still provide a valuable role in this procedure that is gaining unprecedented popularity.
Everything a General Practitioner needs to know about Laser Vision Correctionpresmedaustralia
This document summarizes an ophthalmic education event on refractive surgery. It defines refractive surgery as procedures that alter how the eye focuses light to improve vision and reduce dependence on glasses or contacts. The most common refractive surgeries are LASIK, PRK, and lens-based procedures like cataract surgery. LASIK involves creating a corneal flap with a laser and then sculpting the exposed corneal tissue with an excimer laser to correct vision. Risks include over/undercorrection, dry eyes, halos, and infections. The document reviews the LASIK procedure step-by-step and presents clinical cases and the provider's 2013 results, which showed over 96% of LASIK patients achieving good unaided distance vision.
This document discusses various eye care services including cataract surgery, glaucoma, laser vision correction, corneal transplantation, and medical tourism in India. It provides details on procedures like cataract surgery techniques, types of intraocular lenses, corneal transplantation types, LASIK, and Epi-LASIK. It also summarizes why medical tourism is growing in India due to lower costs, world-class facilities, and Arman Healthcare which assists foreign patients with treatment planning and arrangements.
Cataract surgery involves removing the clouded lens and replacing it with an artificial lens implant. It is usually an outpatient procedure that takes less than an hour using local anesthesia. Most patients have improved vision after surgery and can resume normal activities within a few days. Complications are rare but may include increased eye pressure or retinal detachment. Regular post-op exams are needed to monitor healing and vision.
A cataract is a cloudy area in the lens of the eye that develops slowly and causes vision to deteriorate. It occurs when proteins in the lens clump together, preventing clear images from reaching the retina. Cataracts are very common in older adults, with over half of those over 80 having them. The cloudy lens can be surgically removed and replaced with an artificial lens to restore vision.
Retinal detachment occurs when the neurosensory retina separates from the underlying pigment epithelium, cutting it off from its blood supply and causing vision loss. It is usually caused by tears in the retina from posterior vitreous detachment. Symptoms include floaters, flashes of light, and blurred or lost vision. Diagnosis is made through examination with an ophthalmoscope. Treatment involves sealing retinal tears with laser or cryotherapy and reattaching the retina surgically using scleral buckling or vitrectomy. Patients require positioning and eye drops post-operatively to prevent further detachment.
LASIK: Essential Facts You Need to KnowAndrew Martin
This document provides essential information about LASIK eye surgery. It explains that LASIK is a laser procedure that can correct vision problems like nearsightedness, farsightedness, and astigmatism. It has a high success and satisfaction rate, with about 96% of patients achieving 20/20 vision or better. The benefits of LASIK include being able to participate in sports and daily activities without glasses or contacts. Recovery is typically quick, with most vision improvement noticed immediately after surgery. LASIK results can last for life but age-related vision issues may still develop later in life. The costs vary depending on individual factors but financing options are available. The document encourages scheduling a free consultation with Dr. Foul
18th International conference on OPHTHALMOLOGY AND VISION SCIENCE,April 24-25...OphthalmologyCongres
18th International Conference on
Ophthalmology and Vision Science
April 24-25, 2023 Amsterdam, Netherlands
Theme- Upgradation and modernization of ophthalmologists via new innovation and Research, which focuses on the most recent innovative improvements and research in the field of Ophthalmology
The document discusses the lens and cataract. It defines the lens as a transparent structure behind the iris that focuses light on the retina. Cataract is defined as any opacity within the lens. The most common cause of cataract is aging, but it can also be caused by trauma, inflammation, diabetes, and other systemic factors. Surgical removal of the cataract involves phacoemulsification, extracapsular extraction, or intracapsular extraction techniques. Post-operative care includes antibiotic and steroid eye drops. Complications include vitreous loss, iris prolapse, and endophthalmitis.
Thyroid eye disease is caused by hyperthyroidism, which leads to swelling of soft tissues around the eyes. Common symptoms include protruding eyes, eyelid retraction, and double vision. Treatment depends on severity but may include lubricants, anti-inflammatory drugs, radiation, or surgery to decompress pressure in the eye socket or correct eyelid and muscle positions. Surgery is generally performed by ophthalmic plastic surgeons and aims to improve eye function, comfort, and appearance.
Retinal detachment occurs when the retina separates from the underlying layer of the eye. It can cause vision loss if not treated. Risk factors include severe nearsightedness, prior eye surgery or injury, family history, and activities that increase intraocular pressure. Symptoms include flashes of light, floaters, and blurred or lost vision. Diagnosis involves eye exams like ultrasound or ophthalmoscopy. Treatment depends on the type of detachment but may include cryotherapy, laser photocoagulation, scleral buckling surgery, pneumatic retinopexy, or vitrectomy. With treatment, retinal detachment can be successfully repaired in 85-95% of cases to restore vision.
The retina is the light-sensitive layer of
tissue that lines the inside of the eye and sends visual messages through the
optic nerve to the brain. When the retina detaches, it is lifted or pulled from
its normal position. If not promptly treated, retinal detachment can
cause permanent vision loss.
In some cases there may be small areas of
the retina that are torn. These areas, called retinal tears or retinal breaks,
can lead to retinal detachment.
Similar to Lasik brochure by Dr. Michael Duplessie (20)
Great talk about uveitis anterior uveitis and posterior uveitis for those who may have missed it or are not members of American Academy of Ophthalmology Meeting. Kudos to Dr. Lowder
Presentation about Floppy Iris Syndrome by David Chang. Excellent talk and worth a read. Posting it for those who may not be members of American Academy of Ophthalmology or just missed it
This document provides an overview of glaucoma, including risk factors, types, and treatment options. It discusses several key points:
- Glaucoma is the leading cause of blindness worldwide and causes permanent vision loss due to damage to retinal ganglion cells.
- Elevated intraocular pressure is a major risk factor, and treatment aims to lower pressure to preserve vision.
- Studies have shown patients whose pressure was consistently below 18 mmHg had little progression, while those over 18 mmHg at more visits faced greater risk of vision loss.
- Diurnal fluctuations in pressure are also correlated with visual field loss, so controlling pressure throughout the day is important.
Stroke occurs when a blood vessel that supplies the brain is blocked or ruptures, depriving brain tissue of oxygen and nutrients. The most common type of stroke is ischemic stroke, which accounts for over 80% of cases and occurs when a blood clot blocks an artery. Less common is hemorrhagic stroke, which occurs when a blood vessel ruptures in or near the brain. Risk factors for stroke include high blood pressure, heart disease, diabetes, smoking, obesity, high cholesterol, physical inactivity, and excessive alcohol use. Prompt treatment is crucial for stroke victims.
This study evaluated the efficacy of LASIK in correcting corneal astigmatism versus lenticular astigmatism. The results showed that LASIK was more effective at correcting corneal astigmatism, leaving a smaller amount of residual uncorrected cylinder, compared to lenticular astigmatism. Correcting the problem at its source on the cornea worked better than creating reverse astigmatism on the cornea to compensate for lenticular astigmatism. The study questions the approach of today's wavefront guided LASIK that aims to correct both corneal and lenticular aberrations on the cornea.
This document discusses 5 cases of issues after LASIK or PRK surgery and the corneal scans and measurements obtained. In several cases, the mono-camera corneal scanning system provided inaccurate or aberrant readings of pachymetry (corneal thickness) and posterior corneal surface due to corneal irregularities, haze, or flatness affecting the light penetration and mathematical reconstruction methods of the system. Ultrasound pachymetry was able to obtain more accurate corneal thickness measurements in these cases where the mono-camera system readings were suspect.
- Studies show that lowering IOP reduces risk of glaucoma progression and maintaining a steady IOP level over time is important. IOP fluctuation is associated with progressive visual field loss and is a stronger predictor of progression than mean IOP. Higher IOP fluctuation during office hours and over 24 hours is seen in glaucoma patients compared to normal subjects.
- Educating patients about their condition and treatment through tools like perimetry, OCT/GDx imaging can help improve compliance which is important for minimizing IOP fluctuations and risk of further optic nerve damage. Compliance is better with once or twice daily dosing compared to multiple medications or more frequent dosing.
DLK is an uncommon complication after lasik. Various etiological agents have been implicated. Responds well to aggressive treatment and early diagnosis
Basavarajeeyam is a Sreshta Sangraha grantha (Compiled book ), written by Neelkanta kotturu Basavaraja Virachita. It contains 25 Prakaranas, First 24 Chapters related to Rogas& 25th to Rasadravyas.
These lecture slides, by Dr Sidra Arshad, offer a quick overview of the physiological basis of a normal electrocardiogram.
Learning objectives:
1. Define an electrocardiogram (ECG) and electrocardiography
2. Describe how dipoles generated by the heart produce the waveforms of the ECG
3. Describe the components of a normal electrocardiogram of a typical bipolar lead (limb II)
4. Differentiate between intervals and segments
5. Enlist some common indications for obtaining an ECG
6. Describe the flow of current around the heart during the cardiac cycle
7. Discuss the placement and polarity of the leads of electrocardiograph
8. Describe the normal electrocardiograms recorded from the limb leads and explain the physiological basis of the different records that are obtained
9. Define mean electrical vector (axis) of the heart and give the normal range
10. Define the mean QRS vector
11. Describe the axes of leads (hexagonal reference system)
12. Comprehend the vectorial analysis of the normal ECG
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14. Explain the concepts of current of injury, J point, and their significance
Study Resources:
1. Chapter 11, Guyton and Hall Textbook of Medical Physiology, 14th edition
2. Chapter 9, Human Physiology - From Cells to Systems, Lauralee Sherwood, 9th edition
3. Chapter 29, Ganong’s Review of Medical Physiology, 26th edition
4. Electrocardiogram, StatPearls - https://www.ncbi.nlm.nih.gov/books/NBK549803/
5. ECG in Medical Practice by ABM Abdullah, 4th edition
6. Chapter 3, Cardiology Explained, https://www.ncbi.nlm.nih.gov/books/NBK2214/
7. ECG Basics, http://www.nataliescasebook.com/tag/e-c-g-basics
Muktapishti is a traditional Ayurvedic preparation made from Shoditha Mukta (Purified Pearl), is believed to help regulate thyroid function and reduce symptoms of hyperthyroidism due to its cooling and balancing properties. Clinical evidence on its efficacy remains limited, necessitating further research to validate its therapeutic benefits.
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Dive into an in-depth exploration of the histological structure of female reproductive system with this comprehensive lecture. Presented by Dr. Ayesha Irfan, Assistant Professor of Anatomy, this presentation covers the Gross anatomy and functional histology of the female reproductive organs. Ideal for students, educators, and anyone interested in medical science, this lecture provides clear explanations, detailed diagrams, and valuable insights into female reproductive system. Enhance your knowledge and understanding of this essential aspect of human biology.
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Rasamanikya is a excellent preparation in the field of Rasashastra, it is used in various Kushtha Roga, Shwasa, Vicharchika, Bhagandara, Vatarakta, and Phiranga Roga. In this article Preparation& Comparative analytical profile for both Formulationon i.e Rasamanikya prepared by Kushmanda swarasa & Churnodhaka Shodita Haratala. The study aims to provide insights into the comparative efficacy and analytical aspects of these formulations for enhanced therapeutic outcomes.
Cell Therapy Expansion and Challenges in Autoimmune DiseaseHealth Advances
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In addition to infrastructure and capacity constraints, CAR-Ts face a very different risk-benefit dynamic in autoimmune compared to oncology, highlighting the need for tolerable therapies with low adverse event risk. CAR-NK and Treg-based therapies are also being developed in certain autoimmune disorders and may demonstrate favorable safety profiles. Several novel non-cell therapies such as bispecific antibodies, nanobodies, and RNAi drugs, may also offer future alternative competitive solutions with variable value propositions.
Widespread adoption of cell therapies will not only require strong efficacy and safety data, but also adapted pricing and access strategies. At oncology-based price points, CAR-Ts are unlikely to achieve broad market access in autoimmune disorders, with eligible patient populations that are potentially orders of magnitude greater than the number of currently addressable cancer patients. Developers have made strides towards reducing cell therapy COGS while improving manufacturing efficiency, but payors will inevitably restrict access until more sustainable pricing is achieved.
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Lasik brochure by Dr. Michael Duplessie
1. back in place, and even more rarely, a flap may be
lost - making this essentially a surface treated pro-
cedure with a more variable result and the possibil-
ity of significant corneal scarring. If the flap/cap is
lost, a corneal transplant operation may be re-
quired. Occasionally, adequate ring suction cannot
be maintained, and LASIK cannot be performed.
Other uncommon flap problems include unwanted
material such as cotton fibers in the interface
(which usually causes no problem), infection (very
rare), folds in the flap or epithelial ingrowth be-
neath it (requiring repositioning and cleaning the
flap) - the flap is usually easy to lift up for several
months post-op
One of the world’s best
Wrote the first textbook chapters on
lasik in the world
Organized the first and largest United
States lasik course
Helped teach the world LASIK
Popularized name LASIK
Over 30,000 surgeries performed
See the future with confidence
Lasik
Prk
2. Organizer of First United States Lasik
Course
Organizer of Largest Lasik Wet lab course
in the world
First textbook chapter written on the lasik
technique
First textbook chapter written on hyperop-
ic lasik
First textbook chapter on Sutureless Cor-
neal Transplantation
Editor Advances in Refractive & Corneal
Surgery
Helped teach the world LASIK
Popularized name LASIK
Over 30,000 surgeries performed
Largest Corneal Fellowship program in
USA
Reviewer for the Journal of the American
Medical Association [JAMA] and Middle
East African Council of Ophthalmology
worldwide firsts and notables: than 2 lines is about 0.5 to 2% for both LASIK and
PRK.
Inflammation (sterile white blood cell infiltrates)
in the treated area occur occasionally in surface
PRK/ usually while wearing the therapeutic band-
age soft contact lens. These usually respond well
to treatment with topical antibiotics and steroids.
Infiltrates are also occasionally seen with LASIK.
Steroid-induced glaucoma. Unlike LASIK, most
surface PRK/ patients require topical steroids for
one to four months to reduce scarring and prevent
regression. A small percentage of patients have a
genetic tendency to develop secondary glaucoma
when given steroids topically for this long. Most
of these cases will return to normal pressures when
steroids are stopped, but a small percentage will
require treatment for glaucoma from then on.
LASIK patients use steroid drops for only one
week and cannot develop steroid-induced glauco-
ma.
Complications Specific to LASIK
These include problems with the instru-
ment that makes the flap (microkeratome) which
result in incomplete flaps, irregular flaps, flaps
with thin spots or holes in it, or a flap that comes
totally off. These require the procedure to be abort-
ed, and then re-done in about three months. Occa-
sionally, if scarring occurs, the LASIK cannot be
repeated and the patient must wear a contact lens
for best vision. Rarely a flap may require suturing
3. Side Effects
Both LASIK and PRK have a low rate of side ef-
fects. These include mild irritation, glare or halos
(more prominent at night), ghost images, and un-
der or overcorrection. Both procedures may pro-
duce a decrease in the quality of night vision
(decreased contrast sensitivity).
Complications
Haze or scarring occurs initially in a mild form in
almost all surface PRK/ cases, but clears in 97% of
cases by one year. Nationally, about 3% of surface
PRK patients may require re-treatment with either
the laser or a non-laser polishing instrument be-
cause of excess haze. In our experience, this rate is
less than 1%. When re-treated, about 90% of these
clear. On the other hand, haze or scarring is ex-
tremely rare in LASIK.
Overcorrection occurs in about 1% of cases with
PRK or LASIK. Significant overcorrection requir-
ing contact lenses or future hyperopic LASIK are
uncommon.
Infections are rare but can result in scarring. Irreg-
ular astigmatism (i.e., a wavy corneal surface) due
to decentration of the laser optical zone or uneven
healing is uncommon with both procedures (less
than 1%). Loss of best correctable vision worse
PAGE 3
ORGANIZER
FIRST UNITED STATES LASIK COURSE
EXPERIENCE DOES MATTER
FELLOWSHIP TRAINED IN CORNEAL AND
REFRACTIVE SURGERY
4. PAGE 4
FIRST BOOK CHAPTER ON
LASIK TECHNIQUE
PUBLISHED WORLDWIDE
In: Duplessie MD, Rocha G, Sanchez-Thorin JC, eds.,
Advances in refractive and corneal surgery. International
Ophthalmology Clinics , 1996. Little Brown & Co., Boston.
priate.
DLK
Diffuse lamellar keratitis (DLK) is a
unique and relatively rare post-operative condition
following LASIK. Severe cases comprise only
about 1 in 5,000 surgeries.
When caught early, the inflammation asso-
ciated with DLK is easy to treat. Therefore it is
imperative that all patients maintain their recom-
mended post-operative follow-up examination
schedule.
If you notice something about your vision
that deviates from Dr. Duplessie and your expecta-
tions, you should notify him immediately.
Payment for Surgical Procedures: Payment is
required at time of procedure.
· LASIK/PRK
Includes:
Unlimited Post-Op Visits for One Year
5 year Enhancement Plan - $
Enhancement plan is not available for patients
with Hyperopia or
Hyperopia with Astigmatism.
5. May be an option, but not everyone is eli-
gible for an additional procedure. Eligibility for
enhancements depends on a number of factors.
For some patients, prescription eye drops
to prevent dilation of the pupil at night may be an
option.
Diagnosis and treatment of clinical dry eye
may alleviate many of the symptoms. Toric con-
tact lenses may be prescribed for those who have
astigmatism. Future advances in laser technology
offer great promise.
Overcorrection, under correction & Regression
About 10-15% of LASIK or PRK/ patients
may require a re-treatment (enhancement or touch-
up) for under correction or regression back to-
wards myopia. Retreatment is more common in
patients who are more myopic or hyperopic and
have higher amounts of astigmatism. With either
PRK or LASIK regression and under correction is
very uncommon with less than 3.00 diopters myo-
pia. Regression can occur quickly, within the first
few weeks after surgery, but it also can occur
slowly over time. Patients who experience regres-
sion will notice their vision changing progressive-
ly. An enhancement procedure can be performed
to correct the residual error, just as is done to treat
an under correction or overcorrection. With laser
treatment there is a potential for both over and un-
der correction. I prefer to wait 3 months to perform
an enhancement. As that point, a LASIK proce-
dure can be performed to correct the residual error,
if the patient and Dr. Duplessie believe it is appro-
PAGE 5
FIRST BOOK CHAPTER ON
HYPEROPIC LASIK
PUBLISHED WORLDWIDE
In: Duplessie MD, Rocha G, Sanchez-Thorin JC, eds.,
Advances in refractive and corneal surgery. International
Ophthalmology Clinics , 1996. Little Brown & Co., Boston.
6. Who is qualified for laser vision correction?
There is little more precious than the gift of
sight. We process almost everything in our lives
through our eyes, and yet 50 percent of people
wear glasses or contacts simply to function.
Are you tired of living in a world you cannot see
without the aid of contact lenses or glasses? Are
you fed up with the hassles of contact lenses or
glasses? Can you imagine starting your morning
able to see not only what time of day it is, but also
what type of day awaits you?
If you answered, “Yes” to any of these ques-
tions, please read through the rest of this booklet
so that you can educate yourself about the laser
vision correction services our practice provides.
What is LASIK?
LASIK is a surgical procedure intended to re-
duce a person's dependency on glasses or contact
lenses. LASIK stands for Laser-Assisted in Situ
Keratomileusis and is a procedure that permanent-
ly changes the shape of the cornea, the clear cover-
ing of the front of the eye, using an excimer laser.
A laser or a knife, called a microkeratome, is used
to cut a flap in the cornea. Pulses from a computer-
controlled laser change the curvature of the cornea
and the flap is replaced.
Dr. Duplessie organized the First United States
Lasik course to teach American doctors how to
perform Lasik. It has become the pre-eminent vi-
sion correction procedure due to rapid healing and
a quick return of vision.
Eye and Vision Errors:
The cornea is a part of the eye that helps focus
servative-free eye drops to insertion of punctal
plugs, depending on the severity of the case. For
almost all patients, dry eye symptoms gradually
subside over the first few weeks or months after
LASIK surgery. If you suspect that you may have
post-operative dry eye, you should contact Dr. Du-
plessie for an evaluation.
Glare/Halos/Starbursts
Many LASIK patients notice a temporary
decrease in night vision with symptoms that in-
clude glare, halos, and starbursts. The experience
of the phenomena can range from mild to severe.
These symptoms usually subside within six
weeks; however, some will continue to experience
them for a greater length of time.
There are several potential causes of de-
creased night vision. The most common is the nor-
mal mild swelling of the LASIK flap, which re-
solves within a few weeks of surgery. Another
cause is incomplete correction of the nearsighted-
ness, farsightedness or astigmatism. Clinical dry
eye can also contribute to the experience of glare
and halos. Rarely the cause is mild irregularities
that the LASIK surgery produces in the shape of
the cornea.
Depending upon the cause, those patients
who experience significant, persistent glare, halos
or starbursts have several treatment options.
Enhancement procedures:
7. months post-operatively. During that time, patients
may experience slight fluctuations in vision
throughout the day. These symptoms generally
diminish with time.
Crispness of Vision
For some patients, vision after LASIK
matches the sharpness of vision they had with
glasses or contact lenses before LASIK. However,
many patients notice that 6/6 vision after LASIK
can be different from 6/6 vision with contact
lenses before LASIK, especially gas permeable
contact lenses. These symptoms often dissipate
within the first six months.
Several published scientific papers have
measured patients' pre-operative and post-
operative contrast sensitivity, and nearly all have
reported that it returns to pre-operative levels with-
in the first six months.
Dry Eyes
Some patients experience dry eyes post-
operatively. The symptoms can vary widely.
When the dry eye is treated, those symptoms di-
minish.
Clinical dry eye is comparatively easy to
diagnose and the great majority of patients respond
well to treatment options ranging from use of pre-
light to create an image on the retina. It works in
much the same way that the lens of a camera fo-
cuses light to create an image on film. The bending
and focusing of light is also known as refraction.
Usually the shape of the cornea and the eye are not
perfect and the image on the retina is out-of-focus
(blurred) or distorted. These imperfections in the
focusing power of the eye are called refractive er-
rors. There are three primary types of refractive
errors: myopia, hyperopia and astigmatism.
· Persons with myopia, or nearsightedness, have
more difficulty seeing distant objects as clearly
as near objects.
· Persons with hyperopia, or farsightedness, have
more difficulty seeing near objects as clearly as
distant objects.
· Astigmatism is a distortion of the image on the
retina caused by irregularities in the cornea or
lens of the eye.
Combinations of myopia and astigmatism
or hyperopia and astigmatism are common. Glass-
es or contact lenses are designed to compensate for
the eye's imperfections. Surgical procedures aimed
at improving the focusing power of the eye are
called refractive surgery.
In LASIK surgery, precise and controlled
removal of corneal tissue by a special laser re-
shapes the cornea changing its focusing power.
The Options: Surface PRK vs. LASIK
Photorefractive surgery:
PRK was the first surgical procedure developed
to reshape the cornea using a laser. The exact
same laser is used for the two types of surgery.
8. Below 5.00 diopters of myopia, there is a choice
between surface PRK/ and LASIK. Both proce-
dures are approved. What are the advantages and
disadvantages of each? With respect to results and
expectations, PRK and LASIK are identical.
LASIK has a miniscule increase in risk of compli-
cations due to creation of the flap. ILasik in an ad-
vanced form of Lasik.
Results
Overall, there does not seem to be a significant
difference between PRK/ and LASIK in the per-
centage of patients achieving 6/6 at the end of six
months. In my hands, they are essentially equal.
Thin Corneas
Sometimes, if a patient's cornea is too thin to safe-
ly perform LASIK, then PRK is the only available
option for refractive surgery. .
Length of Procedure
Both are quite short. Surface PRK takes about
three minutes of actual treatment time. LASIK re-
quires about one to two minutes additional actual
treatment time. There is no discomfort during ei-
ther procedure. With LASIK, there is a pressure
sensation and a graying out of vision for about 30
seconds while the corneal flap is created.
Complexity
LASIK is definitely more complex with
respect to both equipment and performance of the
procedure itself. The surgeons experience and ex-
and examine your eye. Dr. Duplessie may give you
one or more types of eye drops to take at home to
help prevent infection. You should wait one to
three days following surgery before beginning any
non-contact sports, depending on the amount of
activity required, how you feel, and Dr. Du-
plessie's instructions.
To help prevent infection, you may need to wait
for up to three days after surgery or until Dr. Du-
plessie advises you otherwise before using lotions,
creams, or make-up around the eye. Dr. Duplessie
may advise you to continue scrubbing your eye-
lashes for a period of time after surgery. You
should also avoid swimming and using hot tubs
or whirlpools for 1 week.
Strenuous contact sports such as boxing, and
karate, etc. should not be attempted for at least 3
months after surgery. It is important to protect
your eyes from anything that might get in them
and from being hit or bumped.
Visual Recovery
Most patients notice an improvement in
their vision immediately upon completion of their
surgery.
By the next day vision is often dramatically
improved. However, patients should understand
that, while fast visual recovery characterizes the
operation, it can take several months before some
patients achieve their final vision after LASIK.
Several studies demonstrate that the vision of a
number of patients continued to improve up to six
9. within the first few days after surgery.
Post-Operative Course
The post op result is similar in both procedures. In
the greater majority of cases, LASIK is more com-
fortable during the first week than surface PRK.
Discomfort is a bit less, achievement of visual acu-
ity is faster, return to full activity is quicker, and
the need for post-operative medications is greatly
diminished with LASIK. Vision becomes crisper
quicker and patients feel more comfortable during
the early post-operative period. It is just a fraction
risker.
Post-Operative Care
· LASIK: A clear plastic shield is worn over
the eye for the first 24 hours, and then
nightly for 2 nights to prevent inadvertent
rubbing of the eye. Eye drops are started
immediately and are used for only 4 days.
· Surface PRK: A therapeutic soft bandage
contact lens is worn for around four days
(depending upon your rate of healing) to
reduce discomfort. Antibiotic, anti-
inflammatory, and cortisone eye drops are
used four times a day while the lens is on.
After removal, the topical cortisone is used
four times a day for a week. Artificial tears
are used as needed.
You will see Dr. Duplessie at regular intervals
for at least the first six months. At the first postop-
erative visit, Dr. Duplessie will test your vision,
pertise is vital. Dr. Duplessie wrote the first text-
book on Lasik; he is one of the best. He has per-
formed over 30,000 procedures.
As with anything, with increased complexi-
ty, there are more possibilities that can go wrong.
Although the overall percentage of complications
of surface PRK and LASIK are approximately the
same, the complications with LASIK are potential-
ly more severe than with PRK.
The technology used in
the ILasik Procedure has been in use for years and
very safe. Dr. Duplessie wrote the first textbook
chapters Lasik and has been performing laser vi-
sion procedures for seventeen years and has per-
formed over 30,000 procedures; 31.4 million pro-
cedures have been performed worldwide to date
making it the most common elective vision proce-
dure. In the U.S. all branches of the U.S. military
and NASA allow the treatment of LASIK for their
servicemen and women, thanks to studies us-
ing ILasik Technology.
The iLASIK Procedure- Space age Technology
- a more advanced technique
The iLASIK Procedure only takes minutes. It re-
shapes your cornea to correct the refractive imper-
fections in your eye (these imperfections are essen-
tially the reason you are nearsighted, farsighted,
etc.). Computers/software are used to make an in-
dividual blueprint of your eyes; this blueprint is
used to drive your laser correction and is what
gives you a truly customized result
Just Asking
It's natural to have a bunch of questions when con-
10. sidering the iLASIK Procedure. Dr. Duplessie is
an expert at answering those questions and his
staff are real pros who will provide plenty of sup-
port during the process.
Custom Vue:
Extremely high success rates with potentially su-
perior vision correction. Makes the laser more ac-
curate. Additional fee for Custom Vue.
LASIK VERSUS CONTACTS- MAYBE CONTACTS
AREN'T THE LONG-TERM ANSWER?
The iLASIK Procedure is safer than wearing con-
tacts lenses.
FINANCIAL FACTS— THE ILASIK PROCEDURE
IS WITHIN YOUR REACH
Money shouldn't be the reason you're putting off
having the iLASIK Procedure. We know that the
simple saying, "you can't put a price on great vi-
sion" doesn't change the fact that you have to find
a way to pay for the procedure.
Dr. Duplessie can help you with financing
What to Expect Before, During and After Laser
Vision Correction:
What to expect before, during, and after surgery
will vary from patient to patient. This section can-
not replace the dialogue you should have with Dr.
Duplessie, but it can help you gain a general un-
derstanding of the pre-, post– and operative stages
the rest of the procedure. Dr. Duplessie will then
lift the flap to dry the exposed tissue.
The laser will be positioned over your eye and
you will be asked to stare at a light. This is not the
laser used to remove tissue from the cornea; it is a
light to help you keep your eye fixed on one spot
once the laser comes on.
When your eye is in the correct position, Dr.
Duplessie will start the laser. At this point in the
surgery, the pulse of the laser makes a ticking
sound. A computer controls the amount of laser
delivered to your eye. Before the start of surgery,
Dr. Duplessie will have programmed the computer
to vaporize a particular amount of tissue based on
the measurements taken at your initial evaluation.
After the pulses of laser energy vaporize the corne-
al tissue, the flap is put back into position.
A shield will be placed over your eye at the end
of the procedure as protection, since no stitches are
used to hold the flap in place.
Postoperative:
Immediately after the procedure, your eye may
feel like there is something in it and Dr. Duplessie
may suggest you take a mild pain reliever. Both
your eyes may tear and water and your vision will
probably be hazy or blurry. You will instinctively
want to rub your eye, but don't! Rubbing your eye
could dislodge the flap, requiring further treat-
ment. In addition, you may experience sensitivity
to light, glare, starbursts or haloes around lights, or
the whites of your eye may look red or bloodshot.
These symptoms should improve considerably
11. the-counter medications and any medications you
may be allergic to.
Dr. Duplessie will perform a thorough eye exam
and discuss what you should expect before, dur-
ing, and after surgery, as well as your responsibili-
ties will be before, during, and after surgery. You
will have the opportunity to ask Dr. Duplessie
questions during this discussion.
The day before surgery, you should stop using
creams, lotions, makeup and perfumes. These
products as well as debris along the eyelashes may
increase the risk of infection during and after sur-
gery. Dr. Duplessie may ask you to scrub your
eyelashes for a period of time before surgery to get
rid of residues and debris along the lashes.
During the procedure:
The procedure should take less than 20 minutes.
You will lie on your back in a reclining chair in an
exam room containing the laser system. The laser
system includes a large machine with a micro-
scope attached to it and a computer screen.
A numbing drop will be placed in your eye, the
area around your eye will be cleaned, and an in-
strument called a lid speculum will be used to hold
your eyelids open. A ring will be placed on your
eye and your vision may dim. The microkeratome,
an instrument, is attached to the ring. Dr. Duples-
sie will use the microkeratome to make a flap in
your cornea.
The microkeratome and the ring are then re-
moved. You will be able to see, but you will expe-
rience fluctuating degrees of blurred vision during
of the procedure.
Preoperative:
If you wear contact lenses, you must stop wear-
ing the lenses four days before your baseline eval-
uation and switch to wearing your glasses full-
time. Contact lenses change the shape of your cor-
nea for up to several weeks after you have stopped
using them depending on the type of contact lenses
you wear. Not leaving your contact lenses out long
enough for your cornea to assume its natural shape
before surgery can have negative consequences.
These consequences include inaccurate measure-
ments and a poor surgical plan, resulting in poor
vision after surgery. These measurements, which
determine how much corneal tissue to remove,
may need to be repeated at least a week after your
initial evaluation and before surgery to make sure
they have not changed, especially if you wear RGP
or hard lenses.
If you wear:
· Soft contact lenses, you should stop wearing
the lenses for 4 days before your initial evaluation.
· Toric soft lenses or rigid gas permeable (RGP)
lenses, you should stop wearing them for at
least 3 weeks before your initial evaluation.
· Hard lenses, you should stop wearing them for
at least 4 weeks before your initial evaluation.
You should tell Dr. Duplessie about your past
and present medical and eye conditions and about
all the medications you are taking, including over-