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.
La chirurgie correctrice au laser peut se faire directement sur la surface oculaire a l'aide du laser excimer. Cette technique n'implique pas la découpe d'un volet et est une excellente alternative pour les patients avec de faibles myopies ou des cornées fines.
La chirurgie correctrice au laser peut se faire directement sur la surface oculaire a l'aide du laser excimer. Cette technique n'implique pas la découpe d'un volet et est une excellente alternative pour les patients avec de faibles myopies ou des cornées fines.
Refractive eye surgeries have become enormously popular worldwide.
Although numerous types of surgical and laser refractive procedures are available today, a procedure known as laser in situ keratomileusis (LASIK) to correct nearsightedness is currently the most common type.
Current Trends in Refractive Surgery - Lecture given at Harvard by Emil Chynn...parkavenuelasek
Dr. Chynn graduated from Harvard's ophthalmology program, which is probably the most famous in the world.
As the only member of his graduating class to specialize in Refractive Surgery, and now an recognized authority, Dr. Chynn is frequently invited back to Harvard to give updates on the State of the Art in Refractive Surgery.
This slide show presentation was given to 100 eye surgeons who flew in from across the country to learn the latest advances in glaucoma, retina, cataract surgery--and laser vision correction (from Dr. Chynn).
The title of his talk reflects the movement in the US and worldwide from leading surgeons that is called "Back to the Surface." This means that surgeons are moving away from LASIK and IntraLase, to avoid flap complications and the # 1 problem causing lawsuits (iatrogenic keratoconus, or KC), and back to the surface.
For some doctors, this means going back to the original procedure, PRK, which has a lot of pain, delayed healing, and scarring.
For Dr. Chynn, this means performing an Advanced Surface Ablation, which is either a LASEK or epiLASEK. These are more advanced than PRK because they do not hurt, healing and recovery is quick, and there is no haze or scarring.
For example, Dr. Chynn performs over 1,000 LASEKs and epiLASEKs per year--he performed his last PRK in 1999.
Obviously, he moved away from PRK to LASIK, then to IntraLase, and now back to the safer LASEK and epiLASEK procedures.
View the following slide show to find out more, and call us with your questions--better yet, come in and meet with our MDs!
Refractive eye surgeries have become enormously popular worldwide.
Although numerous types of surgical and laser refractive procedures are available today, a procedure known as laser in situ keratomileusis (LASIK) to correct nearsightedness is currently the most common type.
Current Trends in Refractive Surgery - Lecture given at Harvard by Emil Chynn...parkavenuelasek
Dr. Chynn graduated from Harvard's ophthalmology program, which is probably the most famous in the world.
As the only member of his graduating class to specialize in Refractive Surgery, and now an recognized authority, Dr. Chynn is frequently invited back to Harvard to give updates on the State of the Art in Refractive Surgery.
This slide show presentation was given to 100 eye surgeons who flew in from across the country to learn the latest advances in glaucoma, retina, cataract surgery--and laser vision correction (from Dr. Chynn).
The title of his talk reflects the movement in the US and worldwide from leading surgeons that is called "Back to the Surface." This means that surgeons are moving away from LASIK and IntraLase, to avoid flap complications and the # 1 problem causing lawsuits (iatrogenic keratoconus, or KC), and back to the surface.
For some doctors, this means going back to the original procedure, PRK, which has a lot of pain, delayed healing, and scarring.
For Dr. Chynn, this means performing an Advanced Surface Ablation, which is either a LASEK or epiLASEK. These are more advanced than PRK because they do not hurt, healing and recovery is quick, and there is no haze or scarring.
For example, Dr. Chynn performs over 1,000 LASEKs and epiLASEKs per year--he performed his last PRK in 1999.
Obviously, he moved away from PRK to LASIK, then to IntraLase, and now back to the safer LASEK and epiLASEK procedures.
View the following slide show to find out more, and call us with your questions--better yet, come in and meet with our MDs!
-IOL formula
1st generation formula : SRK, Binkhost
2nd generation formula : SRK II
3rd generation formula: Hoffer Q, Holladay 1, SRK/T
4th generation formula: Haigis, Holladay 2, Olsen
-The Hoffer Q, Holladay I, and SRK/T formula are all commonly used.
This is to explian the basic Principle of Electrosurgical unit
It includes Principle
Block diagram,types various techniques,front and back panel of the machine,hazards,advantages etc.
Wavefront guided laser surgery - Zyoptic HD ® 2017Bijan Farpour
L'evolution de la chirurgie réfractive au laser permet de faire des traitement " wavefront" personnalisé afin de compenser les imperfections optiques aboutissant a des visions "HD". ( haute définition)
Blade Free Lasik Surgery India,Price Blade Lasik Surgery Delhi India,Blade Free Lasik Surgery Cost In India Info On Cost Blade Free Lasik Surgery Mumbai Delhi Bangalore India,Blade Free Lasik Surgery Treatment Hospitals India,Blade Free Lasik Surgery Doctors Surgeon India,Blade Free Lasik Surgery Center India
Cataract Refractive is a leader in the field of Ophthalmology located in Cape Coral Florida. We are providing the highest level of diagnostic and eye treatment services like eye surgery, glaucoma treatment, cataract surgery, lasik refractive surgery and dry eye treatment etc.
Although both PRK and Bladeless Lasik Surgery is very similar in their respective processes, there are still differences between the two. Know what key points differentiates PRK vs Lasik Eye Surgery.
Get the best Lasik surgery in Mumbai and enjoy the freedom of never having to wear glasses or contact lenses again with the safe and painless Lasik surgery in Mumbai.
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/
PRK is the procedure done with the excimer laser to reshape the cornea and correct the vision. It has fewer complications as compared to LASER. Unlike LASER, the PRK procedure does not require the formation of a corneal flap thereby reducing the complications related to corneal flap. PRK was the first procedure for correcting the curvature of cornea which was approved by US FDA
Age Related Macular Degeneration- Update with Case Studiespresmedaustralia
Eyelea has being introduced in November 2012. It is expected to be the first choice treatment for Neovascular AMD (instead of Lucentis). This talk discusses the reasons for this change.
Visual field testing is an important diagnostic consideration in the evaluation of patients with many different types of pathologies. Most commonly, it is used for conditions affecting the optic nerve and other forms of neurological disease; but it’s also helpful for retinal conditions and instances when visual field function needs to be measured.
At the end of the lecture optometrists will have a better understanding of testing and interpreting visual field results.
Pulmonary Thromboembolism - etilogy, types, medical- Surgical and nursing man...VarunMahajani
Disruption of blood supply to lung alveoli due to blockage of one or more pulmonary blood vessels is called as Pulmonary thromboembolism. In this presentation we will discuss its causes, types and its management in depth.
Title: Sense of Taste
Presenter: Dr. Faiza, Assistant Professor of Physiology
Qualifications:
MBBS (Best Graduate, AIMC Lahore)
FCPS Physiology
ICMT, CHPE, DHPE (STMU)
MPH (GC University, Faisalabad)
MBA (Virtual University of Pakistan)
Learning Objectives:
Describe the structure and function of taste buds.
Describe the relationship between the taste threshold and taste index of common substances.
Explain the chemical basis and signal transduction of taste perception for each type of primary taste sensation.
Recognize different abnormalities of taste perception and their causes.
Key Topics:
Significance of Taste Sensation:
Differentiation between pleasant and harmful food
Influence on behavior
Selection of food based on metabolic needs
Receptors of Taste:
Taste buds on the tongue
Influence of sense of smell, texture of food, and pain stimulation (e.g., by pepper)
Primary and Secondary Taste Sensations:
Primary taste sensations: Sweet, Sour, Salty, Bitter, Umami
Chemical basis and signal transduction mechanisms for each taste
Taste Threshold and Index:
Taste threshold values for Sweet (sucrose), Salty (NaCl), Sour (HCl), and Bitter (Quinine)
Taste index relationship: Inversely proportional to taste threshold
Taste Blindness:
Inability to taste certain substances, particularly thiourea compounds
Example: Phenylthiocarbamide
Structure and Function of Taste Buds:
Composition: Epithelial cells, Sustentacular/Supporting cells, Taste cells, Basal cells
Features: Taste pores, Taste hairs/microvilli, and Taste nerve fibers
Location of Taste Buds:
Found in papillae of the tongue (Fungiform, Circumvallate, Foliate)
Also present on the palate, tonsillar pillars, epiglottis, and proximal esophagus
Mechanism of Taste Stimulation:
Interaction of taste substances with receptors on microvilli
Signal transduction pathways for Umami, Sweet, Bitter, Sour, and Salty tastes
Taste Sensitivity and Adaptation:
Decrease in sensitivity with age
Rapid adaptation of taste sensation
Role of Saliva in Taste:
Dissolution of tastants to reach receptors
Washing away the stimulus
Taste Preferences and Aversions:
Mechanisms behind taste preference and aversion
Influence of receptors and neural pathways
Impact of Sensory Nerve Damage:
Degeneration of taste buds if the sensory nerve fiber is cut
Abnormalities of Taste Detection:
Conditions: Ageusia, Hypogeusia, Dysgeusia (parageusia)
Causes: Nerve damage, neurological disorders, infections, poor oral hygiene, adverse drug effects, deficiencies, aging, tobacco use, altered neurotransmitter levels
Neurotransmitters and Taste Threshold:
Effects of serotonin (5-HT) and norepinephrine (NE) on taste sensitivity
Supertasters:
25% of the population with heightened sensitivity to taste, especially bitterness
Increased number of fungiform papillae
Acute scrotum is a general term referring to an emergency condition affecting the contents or the wall of the scrotum.
There are a number of conditions that present acutely, predominantly with pain and/or swelling
A careful and detailed history and examination, and in some cases, investigations allow differentiation between these diagnoses. A prompt diagnosis is essential as the patient may require urgent surgical intervention
Testicular torsion refers to twisting of the spermatic cord, causing ischaemia of the testicle.
Testicular torsion results from inadequate fixation of the testis to the tunica vaginalis producing ischemia from reduced arterial inflow and venous outflow obstruction.
The prevalence of testicular torsion in adult patients hospitalized with acute scrotal pain is approximately 25 to 50 percent
Couples presenting to the infertility clinic- Do they really have infertility...Sujoy Dasgupta
Dr Sujoy Dasgupta presented the study on "Couples presenting to the infertility clinic- Do they really have infertility? – The unexplored stories of non-consummation" in the 13th Congress of the Asia Pacific Initiative on Reproduction (ASPIRE 2024) at Manila on 24 May, 2024.
Recomendações da OMS sobre cuidados maternos e neonatais para uma experiência pós-natal positiva.
Em consonância com os ODS – Objetivos do Desenvolvimento Sustentável e a Estratégia Global para a Saúde das Mulheres, Crianças e Adolescentes, e aplicando uma abordagem baseada nos direitos humanos, os esforços de cuidados pós-natais devem expandir-se para além da cobertura e da simples sobrevivência, de modo a incluir cuidados de qualidade.
Estas diretrizes visam melhorar a qualidade dos cuidados pós-natais essenciais e de rotina prestados às mulheres e aos recém-nascidos, com o objetivo final de melhorar a saúde e o bem-estar materno e neonatal.
Uma “experiência pós-natal positiva” é um resultado importante para todas as mulheres que dão à luz e para os seus recém-nascidos, estabelecendo as bases para a melhoria da saúde e do bem-estar a curto e longo prazo. Uma experiência pós-natal positiva é definida como aquela em que as mulheres, pessoas que gestam, os recém-nascidos, os casais, os pais, os cuidadores e as famílias recebem informação consistente, garantia e apoio de profissionais de saúde motivados; e onde um sistema de saúde flexível e com recursos reconheça as necessidades das mulheres e dos bebês e respeite o seu contexto cultural.
Estas diretrizes consolidadas apresentam algumas recomendações novas e já bem fundamentadas sobre cuidados pós-natais de rotina para mulheres e neonatos que recebem cuidados no pós-parto em unidades de saúde ou na comunidade, independentemente dos recursos disponíveis.
É fornecido um conjunto abrangente de recomendações para cuidados durante o período puerperal, com ênfase nos cuidados essenciais que todas as mulheres e recém-nascidos devem receber, e com a devida atenção à qualidade dos cuidados; isto é, a entrega e a experiência do cuidado recebido. Estas diretrizes atualizam e ampliam as recomendações da OMS de 2014 sobre cuidados pós-natais da mãe e do recém-nascido e complementam as atuais diretrizes da OMS sobre a gestão de complicações pós-natais.
O estabelecimento da amamentação e o manejo das principais intercorrências é contemplada.
Recomendamos muito.
Vamos discutir essas recomendações no nosso curso de pós-graduação em Aleitamento no Instituto Ciclos.
Esta publicação só está disponível em inglês até o momento.
Prof. Marcus Renato de Carvalho
www.agostodourado.com
Tom Selleck Health: A Comprehensive Look at the Iconic Actor’s Wellness Journeygreendigital
Tom Selleck, an enduring figure in Hollywood. has captivated audiences for decades with his rugged charm, iconic moustache. and memorable roles in television and film. From his breakout role as Thomas Magnum in Magnum P.I. to his current portrayal of Frank Reagan in Blue Bloods. Selleck's career has spanned over 50 years. But beyond his professional achievements. fans have often been curious about Tom Selleck Health. especially as he has aged in the public eye.
Follow us on: Pinterest
Introduction
Many have been interested in Tom Selleck health. not only because of his enduring presence on screen but also because of the challenges. and lifestyle choices he has faced and made over the years. This article delves into the various aspects of Tom Selleck health. exploring his fitness regimen, diet, mental health. and the challenges he has encountered as he ages. We'll look at how he maintains his well-being. the health issues he has faced, and his approach to ageing .
Early Life and Career
Childhood and Athletic Beginnings
Tom Selleck was born on January 29, 1945, in Detroit, Michigan, and grew up in Sherman Oaks, California. From an early age, he was involved in sports, particularly basketball. which played a significant role in his physical development. His athletic pursuits continued into college. where he attended the University of Southern California (USC) on a basketball scholarship. This early involvement in sports laid a strong foundation for his physical health and disciplined lifestyle.
Transition to Acting
Selleck's transition from an athlete to an actor came with its physical demands. His first significant role in "Magnum P.I." required him to perform various stunts and maintain a fit appearance. This role, which he played from 1980 to 1988. necessitated a rigorous fitness routine to meet the show's demands. setting the stage for his long-term commitment to health and wellness.
Fitness Regimen
Workout Routine
Tom Selleck health and fitness regimen has evolved. adapting to his changing roles and age. During his "Magnum, P.I." days. Selleck's workouts were intense and focused on building and maintaining muscle mass. His routine included weightlifting, cardiovascular exercises. and specific training for the stunts he performed on the show.
Selleck adjusted his fitness routine as he aged to suit his body's needs. Today, his workouts focus on maintaining flexibility, strength, and cardiovascular health. He incorporates low-impact exercises such as swimming, walking, and light weightlifting. This balanced approach helps him stay fit without putting undue strain on his joints and muscles.
Importance of Flexibility and Mobility
In recent years, Selleck has emphasized the importance of flexibility and mobility in his fitness regimen. Understanding the natural decline in muscle mass and joint flexibility with age. he includes stretching and yoga in his routine. These practices help prevent injuries, improve posture, and maintain mobilit
These simplified slides by Dr. Sidra Arshad present an overview of the non-respiratory functions of the respiratory tract.
Learning objectives:
1. Enlist the non-respiratory functions of the respiratory tract
2. Briefly explain how these functions are carried out
3. Discuss the significance of dead space
4. Differentiate between minute ventilation and alveolar ventilation
5. Describe the cough and sneeze reflexes
Study Resources:
1. Chapter 39, Guyton and Hall Textbook of Medical Physiology, 14th edition
2. Chapter 34, Ganong’s Review of Medical Physiology, 26th edition
3. Chapter 17, Human Physiology by Lauralee Sherwood, 9th edition
4. Non-respiratory functions of the lungs https://academic.oup.com/bjaed/article/13/3/98/278874
Flu Vaccine Alert in Bangalore Karnatakaaddon Scans
As flu season approaches, health officials in Bangalore, Karnataka, are urging residents to get their flu vaccinations. The seasonal flu, while common, can lead to severe health complications, particularly for vulnerable populations such as young children, the elderly, and those with underlying health conditions.
Dr. Vidisha Kumari, a leading epidemiologist in Bangalore, emphasizes the importance of getting vaccinated. "The flu vaccine is our best defense against the influenza virus. It not only protects individuals but also helps prevent the spread of the virus in our communities," he says.
This year, the flu season is expected to coincide with a potential increase in other respiratory illnesses. The Karnataka Health Department has launched an awareness campaign highlighting the significance of flu vaccinations. They have set up multiple vaccination centers across Bangalore, making it convenient for residents to receive their shots.
To encourage widespread vaccination, the government is also collaborating with local schools, workplaces, and community centers to facilitate vaccination drives. Special attention is being given to ensuring that the vaccine is accessible to all, including marginalized communities who may have limited access to healthcare.
Residents are reminded that the flu vaccine is safe and effective. Common side effects are mild and may include soreness at the injection site, mild fever, or muscle aches. These side effects are generally short-lived and far less severe than the flu itself.
Healthcare providers are also stressing the importance of continuing COVID-19 precautions. Wearing masks, practicing good hand hygiene, and maintaining social distancing are still crucial, especially in crowded places.
Protect yourself and your loved ones by getting vaccinated. Together, we can help keep Bangalore healthy and safe this flu season. For more information on vaccination centers and schedules, residents can visit the Karnataka Health Department’s official website or follow their social media pages.
Stay informed, stay safe, and get your flu shot today!
Prix Galien International 2024 Forum ProgramLevi Shapiro
June 20, 2024, Prix Galien International and Jerusalem Ethics Forum in ROME. Detailed agenda including panels:
- ADVANCES IN CARDIOLOGY: A NEW PARADIGM IS COMING
- WOMEN’S HEALTH: FERTILITY PRESERVATION
- WHAT’S NEW IN THE TREATMENT OF INFECTIOUS,
ONCOLOGICAL AND INFLAMMATORY SKIN DISEASES?
- ARTIFICIAL INTELLIGENCE AND ETHICS
- GENE THERAPY
- BEYOND BORDERS: GLOBAL INITIATIVES FOR DEMOCRATIZING LIFE SCIENCE TECHNOLOGIES AND PROMOTING ACCESS TO HEALTHCARE
- ETHICAL CHALLENGES IN LIFE SCIENCES
- Prix Galien International Awards Ceremony
NVBDCP.pptx Nation vector borne disease control programSapna Thakur
NVBDCP was launched in 2003-2004 . Vector-Borne Disease: Disease that results from an infection transmitted to humans and other animals by blood-feeding arthropods, such as mosquitoes, ticks, and fleas. Examples of vector-borne diseases include Dengue fever, West Nile Virus, Lyme disease, and malaria.
- Video recording of this lecture in English language: https://youtu.be/lK81BzxMqdo
- Video recording of this lecture in Arabic language: https://youtu.be/Ve4P0COk9OI
- Link to download the book free: https://nephrotube.blogspot.com/p/nephrotube-nephrology-books.html
- Link to NephroTube website: www.NephroTube.com
- Link to NephroTube social media accounts: https://nephrotube.blogspot.com/p/join-nephrotube-on-social-media.html
New Drug Discovery and Development .....NEHA GUPTA
The "New Drug Discovery and Development" process involves the identification, design, testing, and manufacturing of novel pharmaceutical compounds with the aim of introducing new and improved treatments for various medical conditions. This comprehensive endeavor encompasses various stages, including target identification, preclinical studies, clinical trials, regulatory approval, and post-market surveillance. It involves multidisciplinary collaboration among scientists, researchers, clinicians, regulatory experts, and pharmaceutical companies to bring innovative therapies to market and address unmet medical needs.
Explore natural remedies for syphilis treatment in Singapore. Discover alternative therapies, herbal remedies, and lifestyle changes that may complement conventional treatments. Learn about holistic approaches to managing syphilis symptoms and supporting overall health.
2. What is refractive surgery?
A group of outpatient procedures used to alter how the
eye focuses light rays on the retina, thereby improving
vision and reducing dependence on glasses and
contact lenses.
Refractive surgery
procedure on the cornea
3. What is refractive surgery?
Most refractive surgery is performed on the cornea and
affects only the front of the eye.
In some cases, refractive surgery procedures don’t
reshape the cornea; instead, the eye’s natural lens is
either replaced or enhanced by an implantable lens
that helps correct vision.
4. Refractive Surgery
Laser vision correction
LASIK
ASLA (Advanced surface laser ablation) ( Formerly PRK)
Lens based surgery
Cataract surgery (patient’s own lens cloudy)
Clear lens exchange (patient’s own lens clear)
(also known as a refractive lens exchange)
5. What is laser in-situ
keratomileusis (LASIK)?
Outpatient refractive surgery used to treat nearsightedness
(myopia), farsightedness (hyperopia) and astigmatism.
LASIK involves:
creating a thin, hinged flap in the cornea, either with a
femtosecond laser or a mechanical blade, which is then gently
folded back to expose the internal structure of the cornea;
using an excimer laser to precisely sculpt the exposed cornea
to correct the refractive error; and
immediately repositioning the thin flap following the laser
application and allowing it to heal naturally.
6. LASIK
For myopia, the corneal tissue is removed centrally in a
lenticular (lens-like) pattern, thereby flattening the central
cornea and reducing the eye’s focusing power to correct the
refractive error.
For hyperopia, the corneal tissue is removed around the
edges, thereby steepening the central cornea and
increasing the eye’s focusing power.
For astigmatism, the corneal tissue is removed in a precise
elliptical pattern that steepens the cornea where it is too
flat and flattens the cornea where it is too steep, thereby
accurately correcting the refractive error.
7. LASIK and Epi-LASIK
A preoperative eye exam includes measurements to give
the surgeon the necessary information to perform the
procedure and to see if the corneas are suitable.
Pre-operative screening and assessment with the staff
Slit lamp exam
8. LASIK and Epi-LASIK
Corneal topography: mapping the surface details of the cornea
Corneal keratometry: measurement of the form and curvature of the
cornea
Corneal pachymetry: measurement of corneal thickness
Aberromerty
Measurements for lens based surgery
Assessment of ocular dominance
Trial of monovision – with glasses in a frame or with contact lenses
Preoperative screening and assessment with the staff
9. LASIK and Epi-LASIK
Surgeon goes through the results obtained by the staff
and rechecks the results
Discusses the patient’s needs and expectations
Attempts to provide the best solution for a given patient
based on age, patient’s lifestyle requirements, corneal
status, presence or absence of a cataract.
Tries to provide a REALISTIC idea of what happens
during the procedure and what to expect afterwards and
what sort of vision result is obtainable.
Discussion of potential risks and complications and
their management
Preoperative assessment with the surgeon
11. LASIK and Epi-LASIK
Prior to the LASIK procedure, the eye(s) are prepped for surgery
and treated with anesthetic drops.
On the day of surgery!
12. Bladeless LASIK
How is bladeless LASIK performed?
A femtosecond laser is used to create a thin, hinged flap of corneal tissue.
This has, in most modern laser vision centres, replaced the mechanical
motorised blade (microkeratome). The laser is far more precise.
13. VisuMax Femtosecond System
The femtosecond laser
incision
• A femtosecond is one million billionth of a second
• High intensity laser light induces a submicron tissue disruption
• A layer of narrow tissue disruption spots create a tissue incision
• A flap incision consists of the stromal flap bed and the sidecut
• Remaining tissue bridges can be separated mechanically
14. LASIK and Epi-LASIK
How is LASIK performed?
Once the flap is lifted to one side . . .
. . . laser energy from an excimer
laser is applied for a few
seconds to a minute or so to
reshape the exposed surface of
your cornea.
15. Excimer Laser
-Excimer laser technology was developed in the late '70's by IBM.
-Designed as a tool to etch very high density circuit patterns in
computer chip manufacturing process.
The fact that excimer laser
treatment does not injure 0r
distort adjacent tissue,
combined with the precise
accuracy of sculpting, makes
it a very effective tool for
etching computer chips, and
an incredibly delicate and
accurate instrument for
correcting vision.
Human hair
sculpted with an
excimer laser
16. LASIK and Epi-LASIK
The tissue flap from the cornea is placed back into its original
position, where it adheres naturally, protecting the treated area and
restoring the smooth front surface of the eye.
How is LASIK performed?
17. Considerations for LASIK surgery
LASIK is a less invasive procedure than intraocular
surgery.
The procedure and visual recovery are quick, and
discomfort is typically minimal.
Corrects up to about -10 dioptres of myopia and +5
dioptres of hyperopia as well as up to about 5 dioptres
of astigmatism.
18. Considerations against LASIK
surgery
LASIK is not recommended for patients with thin corneas.
LASIK is not recommended for patients with keratoconus
(irregular protrusion of the cornea), or other corneal
diseases.
LASIK is not recommended if myopia, hyperopia or
astigmatism is beyond the approved parameters of the
procedure.
LASIK is not recommended for patients with significant
systemic medical illnesses that may severely affect healing.
LASIK is not recommended for patients with severe dry
eye.
After LASIK, you may be restricted from certain
occupations.
19. A word about ASLA/PRK
ASLA (advanced surface laser ablation) – was formerly known as PRK
(photorefractive keratectomy) involves scraping away of the top layer
of cells of the cornea after loosening them with an alcohol solution
and then applying the excimer laser directly to the cornea. Contact
lens worn for about 5 days.
NO CORNEAL FLAP.
Painful for 2-5 days and slower healing than LASIK. Drops may be
needed for up to 2-3 months post-op.
Final result usually same as LASIK
Used at LVCCC in patients with corneas too thin for LASIK. Our 2012
analysis showed 94% of our procedures were LASIK and 6% were
ASLA.
Some centres ONLY perform ASLA and not LASIK. It is often
promoted as “incision-free” laser vision correction
20. Risks and possible side effects of LASIK surgery
• Overcorrection or undercorrection (with a possible
need for retreatment – “enhancement”)
Reduced contrast vision (sharpness)
Poor night vision
Glare, halos, starburst, ghosting of images
Corneal infection
Light sensitivity
Dry eyes
Flap complication (either during or following surgery)
Regression of initial surgical effect
21. Options for reducing spectacle dependence
If a patient is aged between 21 and about 40 years old
they can have laser vision correction to both eyes to
provide them with good unaided distance vision. The
eye can then accommodate to focus on intermediate
(eg. dashboard of car, computer) and near (eg.
reading) vision tasks.
Over the age of about 40 accommodation starts to
reduce and presbyopia sets in with the need to have to
wear reading glasses or bifocal or multifocal glasses.
The eye becomes increasingly “fixed” for best focus at
one particular distance.
22. Options for reducing spectacle dependence
Presbyopia creates a challenge in achieving independence
from glasses or contact lenses.
If both eyes are treated to provide good unaided reading
vision then good unaided distance vision is lost.
One option is “monovision” in which one eye is made slightly
short sighted to provide reading vision without glasses and
the other eye is made (or kept) as the eye with good unaided
distance vision.
Monovision can be performed with laser vision correction or
with cataract surgery.
Not suitable for everyone – often involves a contact lens trial
to assess suitability and likelihood of patient satisfaction.
23. Options for reducing spectacle dependence
For those over about 55 -60 years old one has to
consider the merits of lens-based surgery over corneal
laser vision correction as people in this age group may
begin to develop cataracts in the near future and lens-
based refractive surgery can not only reduce spectacle
dependence but get rid of a cataract if one is already
present and eliminate the need for a subsequent
cataract procedure in the future if the patient has no
cataract.
24. Cost Of Laser Vision Correction
The cost varies quite widely from about $1200 per eye to
about $3500 per eye.
Why the huge range in cost?
Quality of the technology available:
Bladeless LASIK involves two lasers – a femtosecond laser to cut the flap and
an excimer laser to reshape the cornea. Some centres use a motorised
mechanical blade (microkeratome) to cut the flap. Less precise than with
laser and higher rate of complications. A femtosecond laser costs about
$ 700,000 whilst a microkeratome costs about $40,000.The higher cost of the
femtosecond laser in bladeless LASIK is usually passed on to the patient.
The procedure being performed
Some centres only perform surface ablation. No corneal flap is made and no
femtosecond laser or microkeratome is required. Only the excimer laser is
needed and the savings can be passed on to the patient. However – increased
pain and longer healing time. More time required off work which may negate
the cost savings compared with LASIK.
30. 96.4%
3.6%
0% 20% 40% 60% 80% 100% 120%
N5 or
better
N6
Eyes
UnaidedDistanceVisualAcuity
Monovision–Unaided Near vision at 1month
Monovision Near Eye: Post-operatively 100% of the eyes that were made short sighted
achieved unaided near vision of N6 or better.