Intraocular lens
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The document discusses intraocular lenses (IOLs), which are artificial lenses implanted in the eyes to replace the crystalline lens after cataract surgery or refractive surgery. It describes the parts and classification of IOLs, including early generation rigid lenses, iris-supported lenses, and later generation flexible foldable lenses. Complications related to IOL implantation and cataract surgery are also reviewed, such as those from regional anesthesia techniques like peribulbar/retrobulbar hemorrhage, and both intraoperative and postoperative complications. Recent advances and the future of IOL technology are mentioned.
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RECENT ADVANCES IN INTRAOCULAR LENS
1) Intraocular lenses (IOLs) are artificial lenses implanted during cataract surgery to replace the clouded natural lens and correct vision. 2) IOLs have evolved over generations from rigid PMMA lenses to modern foldable designs made of silicone, acrylic, or hydrogel materials. 3) IOLs can be mono-focal, providing a single vision correction, or multi-focal, attempting to provide both near and distance vision without glasses. Accommodating IOL designs also aim to restore the eye's ability to focus at different distances.
Intraocular lenses
Intraocular lenses have evolved significantly from the early rigid lens designs implanted in the 1950s. Modern intraocular lenses are classified based on location, design, and material. Premium lens options include multifocal lenses that provide multiple focal points for both distance and near vision, toric lenses that correct astigmatism, and accommodating lenses designed to restore the eye's ability to focus on near objects. Proper patient selection is important for multifocal lenses, considering an individual's lifestyle and visual needs.
Newer IOLs
This document discusses the evolution of intraocular lenses (IOLs) from early generations implanted in the 1950s to newer IOL designs. It covers generations I-VI of IOLs and their complications. Newer IOL designs discussed in more detail include aspheric, multifocal, accommodative, toric, phakic and aniridia IOLs. The benefits and limitations of different IOL materials and designs are presented.
Intra Ocular lens
The document provides an overview of intraocular lenses (IOLs). It discusses the history and definition of IOLs, the generations of IOLs, parts of an IOL, IOL designs, materials, and properties. It also covers IOL placement sites, power calculation, complications like posterior capsular opacification, and recent advances in premium IOLs including multifocal, accommodative, and toric lenses.
Intra Oular Lenses
Sir Harold Ridley was the first to successfully implant an intraocular lens in 1949 using polymethylmethacrylate (PMMA). Early intraocular lenses had high complication rates of dislocation and glaucoma. The evolution of intraocular lens design led to foldable lenses made of silicone and acrylic materials that are implanted in the capsular bag for better stability and lower complication rates. Modern multifocal and toric intraocular lenses provide patients with independence from glasses by correcting presbyopia and astigmatism. Precise biometry and surgical technique are important for optimal outcomes with premium intraocular lenses.
IOL power calculation formulae
The document discusses various formulas used for calculating intraocular lens (IOL) power, including SRK, SRK2, Holladay, Haigis, and Holladay 2. It explains the factors these formulas account for such as axial length, corneal power, anterior chamber depth, and how they have evolved over generations to improve accuracy. Special considerations for calculating IOL power in cases involving prior refractive surgery, silicone oil filling, posterior staphyloma, and using optical biometry devices are also summarized.
Newer phacoemulsification techniques
Basic overview of phaco dynamics along with all the Newer phacoemulsification techniques available in current practice - a video-assisted the presentation
IOL ( Intraocular lens) in another way...IOL Design
Ophthalmology Lectures: Usually we are caring about the power of IOL ..Now we are thinking Of IOL Design .
Recommended
RECENT ADVANCES IN INTRAOCULAR LENS
1) Intraocular lenses (IOLs) are artificial lenses implanted during cataract surgery to replace the clouded natural lens and correct vision. 2) IOLs have evolved over generations from rigid PMMA lenses to modern foldable designs made of silicone, acrylic, or hydrogel materials. 3) IOLs can be mono-focal, providing a single vision correction, or multi-focal, attempting to provide both near and distance vision without glasses. Accommodating IOL designs also aim to restore the eye's ability to focus at different distances.
Intraocular lenses
Intraocular lenses have evolved significantly from the early rigid lens designs implanted in the 1950s. Modern intraocular lenses are classified based on location, design, and material. Premium lens options include multifocal lenses that provide multiple focal points for both distance and near vision, toric lenses that correct astigmatism, and accommodating lenses designed to restore the eye's ability to focus on near objects. Proper patient selection is important for multifocal lenses, considering an individual's lifestyle and visual needs.
Newer IOLs
This document discusses the evolution of intraocular lenses (IOLs) from early generations implanted in the 1950s to newer IOL designs. It covers generations I-VI of IOLs and their complications. Newer IOL designs discussed in more detail include aspheric, multifocal, accommodative, toric, phakic and aniridia IOLs. The benefits and limitations of different IOL materials and designs are presented.
Intra Ocular lens
The document provides an overview of intraocular lenses (IOLs). It discusses the history and definition of IOLs, the generations of IOLs, parts of an IOL, IOL designs, materials, and properties. It also covers IOL placement sites, power calculation, complications like posterior capsular opacification, and recent advances in premium IOLs including multifocal, accommodative, and toric lenses.
Intra Oular Lenses
Sir Harold Ridley was the first to successfully implant an intraocular lens in 1949 using polymethylmethacrylate (PMMA). Early intraocular lenses had high complication rates of dislocation and glaucoma. The evolution of intraocular lens design led to foldable lenses made of silicone and acrylic materials that are implanted in the capsular bag for better stability and lower complication rates. Modern multifocal and toric intraocular lenses provide patients with independence from glasses by correcting presbyopia and astigmatism. Precise biometry and surgical technique are important for optimal outcomes with premium intraocular lenses.
IOL power calculation formulae
The document discusses various formulas used for calculating intraocular lens (IOL) power, including SRK, SRK2, Holladay, Haigis, and Holladay 2. It explains the factors these formulas account for such as axial length, corneal power, anterior chamber depth, and how they have evolved over generations to improve accuracy. Special considerations for calculating IOL power in cases involving prior refractive surgery, silicone oil filling, posterior staphyloma, and using optical biometry devices are also summarized.
Newer phacoemulsification techniques
Basic overview of phaco dynamics along with all the Newer phacoemulsification techniques available in current practice - a video-assisted the presentation
IOL ( Intraocular lens) in another way...IOL Design
Ophthalmology Lectures: Usually we are caring about the power of IOL ..Now we are thinking Of IOL Design .
Anophthalmic socket
Anophthalmia is the absence of the eyeball and can be congenital or acquired. The optimal management of an anophthalmic socket involves maintaining adequate volume with a well-positioned implant, healthy conjunctiva, and symmetric eyelids. Complications after enucleation like enophthalmos, eyelid deformities, and socket contracture can be addressed through procedures like dermis fat grafts, fornix deepening sutures, and implant replacement. Proper prosthesis fitting and care is also important for optimal cosmetic and functional results.
Orbital implants
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د.سامي البديرات
استشاري طب وجراحة العيون
استشاري جراحة العيون التجميليه
الاردن -عمان
مستشفى العيون التخصصي
Types of iol
Types of intraocular lenses include foldable acrylic and silicone lenses. IOLs are either single piece or multipiece, and have different optic designs like aspheric, toric, or multifocal to correct vision. IOLs are implanted either in the capsular bag or ciliary sulcus, and are made of materials like acrylic, silicone, or hydrogels. Newer accommodating IOL designs aim to restore accommodation.
Ocular viscosurgical devices
The document summarizes ocular viscosurgical devices used in ophthalmic procedures. It discusses the history and ideal properties of viscoelastic substances. Commonly used families include sodium hyaluronate, chondroitin sulfate, and hydroxypropyl methylcellulose. Physical properties like viscosity, pseudoplasticity, and coatability are described. Clinical applications involve cataract surgery, glaucoma surgery, and keratoplasty. Complications from use include increased intraocular pressure and capsular block syndrome.
Glaucoma drainage devices
Glaucoma drainage devices (GDDs) provide an alternative pathway for aqueous humor outflow and are used to treat refractory glaucoma. The document discusses the history, design, and types of various GDDs including non-valved devices like Baerveldt and Molteno implants as well as valved devices like the Ahmed Glaucoma Valve. The key components, materials, and surgical techniques for GDD implantation are also summarized.
Anophthalmic socket
Anophthalmia is the absence of the eyeball and can be congenital or acquired. The optimal anophthalmic socket has a well-positioned implant, healthy conjunctiva, symmetric eyelids, and a comfortable prosthesis. Complications after enucleation include enophthalmos, eyelid deformities, and socket contracture. Management involves orbital implants, dermis fat grafts, fornix deepening, and lid procedures to correct volume deficits and improve prosthesis retention.
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This document discusses ophthalmic viscosurgical devices (OVDs), including their history, properties, composition, classification, and uses. It begins by describing the introduction of sodium hyaluronate as the first OVD used in ophthalmic surgery in 1972. It then covers the ideal properties of an OVD and the rheological properties of viscosity, elasticity, coatability, and others. OVDs are classified as cohesive, dispersive, or viscoadaptive based on their molecular structure and behavior. The document discusses the advantages and uses of OVDs in cataract surgery, glaucoma surgery, keratoplasty, and other ophthalmic procedures. It concludes by outlining complications like
Sutures & needles in ophthalmology
This document discusses sutures and needles used in ophthalmology. It begins with a brief history of sutures and then defines an ideal suture material. The rest of the document describes the characteristics, types, sizes, and shapes of both absorbable and non-absorbable sutures and needles. It also provides examples of common sutures and needles used for different ophthalmic procedures.
Keratprosthesis
Keratoprosthesis is a surgical procedure where an artificial cornea replaces a severely damaged or diseased natural cornea. It involves implanting an artificial optical cylinder made of clear plastic materials inside the eye with a supporting flange or skirt outside the eye. The Boston KPro is the most commonly used keratoprosthesis device and comes in Type 1 and Type 2 models for different clinical situations. The Osteo-Odonto KPro is a more complex multi-stage procedure that uses the patient's own tooth and surrounding bone to support an artificial cornea for patients with severe dry eye conditions. Keratoprosthesis surgery aims to restore sight for patients with corneal blindness when traditional corneal transplant is not possible or
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This document summarizes corneal anatomy and transplantation techniques. It provides an in-depth review of Descemet's stripping automated endothelial keratoplasty (DSAEK), including indications, surgical technique, outcomes, complications, and future directions. DSAEK involves stripping the recipient's Descemet's membrane and inserting a donor posterior corneal graft to treat endothelial dysfunction. It has advantages over penetrating keratoplasty like faster visual recovery and less astigmatism. Complications include graft dislocation and failure. Newer techniques like DMEK may provide better outcomes.
IOL power calculation special situations
IOL power calculation is challenging in eyes with prior refractive surgery or other special situations. In eyes with prior radial keratotomy, standard keratometry overestimates corneal power due to flattening outside the central optical zone. Multiple methods of IOL power calculation should be used, including topography to measure the flattest central corneal power. A study comparing methods in eyes with prior RK found IOL power calculation using topographic keratometry was least accurate compared to formulas from the ESCRS calculator. No single method provided reliable results, highlighting the difficulty in IOL power calculation for eyes with prior refractive surgery.
IOL Selection- What to Ask and What to Tell Patients
This document discusses factors to consider when selecting an intraocular lens (IOL) for cataract surgery. It notes that the patient's visual goals, the surgeon's expertise, and improvements in IOL technology all converge to determine the best IOL choice. Key factors include visual quality, patient expectations and needs, IOL design, and the surgeon's experience. Age-related eye changes and aberrations must also be addressed. Newer "multifocal light" IOLs aim to provide good distance and near vision with fewer side effects compared to traditional multifocal IOLs. The continual goal is high quality vision correction taking into account higher order aberrations like spherical aberration.
Intra ocular lens
An intraocular lens (IOL) is an artificial lens implanted in the eye during cataract surgery or refractive lens exchange to replace the natural crystalline lens and correct vision. IOLs have evolved over generations from rigid PMMA lenses to modern foldable designs made of silicone, acrylic, or hydrogel materials. IOLs are either placed in the posterior chamber behind the iris or in the anterior chamber in front of the iris. Newer multifocal and accommodating IOL designs aim to provide both distance and near vision. Precise biometry is required to calculate the optimal IOL power to achieve the desired postoperative refraction. Potential complications include dislocation, opacification, deposits, and inflammation.
Keratorefractive surgeries
This document discusses keratorefractive surgeries. It begins by describing the anatomy of the cornea, including the epithelium, Bowman's layer, stroma, Descemet's membrane, and endothelium. It then provides a brief history of keratorefractive surgeries and classifications including location, addition, subtraction, relaxation, and compression techniques. Common keratorefractive surgeries discussed include PRK, LASEK, LASIK, epikeratophakia, keratophakia, and excimer laser procedures. Complications, indications, and the role of techniques like corneal topography and wavefront analysis are also summarized.
Nonpenetrating glaucoma surgery
This document discusses non-penetrating glaucoma surgery techniques that facilitate the drainage of aqueous humor through the trabecular meshwork and Schlemm's canal without opening the anterior chamber. It describes several procedures including deep sclerectomy, viscocanalostomy, canaloplasty, ab-externo trabeculectomy, and laser trabecular ablation. The goal is to bypass the highest resistance point to outflow in the juxtacanalicular meshwork. Advantages include lower risks of complications like hypotony compared to penetrating surgeries. Indications and contraindications are provided for various non-penetrating glaucoma procedures.
Congenital infantile esotropia
This document discusses congenital infantile esotropia. It defines esotropia as eyes turning inward and provides background on types. Congenital infantile esotropia is characterized by a large-angle esotropia present before 6 months of age. It may be associated with cerebral palsy or low birth weight. Treatment involves correcting refractive errors, amblyopia therapy, and bilateral medial rectus recession surgery between 6 months to 2 years of age. Post-surgical outcomes include orthophoria, small residual deviations managed with observation, or large residual deviations requiring repeat surgery.
Evolution, types, materials of iol
prepared during lens session
reference :
1) Ophthalmology : Yanoff & Duker : 4th edition.
2) AAO : Section 11 : 2014-2015
Mgmt of pcr
This document discusses posterior capsule tears that can occur during cataract surgery. It covers the predisposing factors, mechanisms, identification, and management strategies for posterior capsule tears with or without vitreous loss. Key points include identifying tears early, stabilizing the anterior chamber with viscoelastic, deciding whether to continue phacoemulsification or convert to extracapsular extraction based on the situation, performing anterior vitrectomy when needed with caution to minimize further vitreous disturbance, and properly placing an IOL. The goal is to remove all lens material and prevent further complications while minimizing additional surgery.
Refractive surprise
This case report describes a patient who experienced refractive surprise following uncomplicated cataract surgery. Axial length measurements from preoperative A-scan were variable, leading to incorrect IOL power calculation. Options for managing refractive surprise include glasses, contact lenses, IOL exchange, piggyback IOL implantation, or corneal refractive surgery. Optical biometry provides more accurate measurements than contact biometry. LASIK is generally the most accurate procedure for correcting residual refractive error, but lens-based procedures are alternatives when excimer laser is unavailable.
Toric iol
This document discusses toric intraocular lenses (IOLs) for correcting astigmatism during cataract surgery. It provides details on the evolution of toric IOL designs from early PMMA lenses that often rotated, to current acrylic models with improved stability. Precise keratometry measurements and accounting for surgically induced astigmatism are important for toric IOL power calculations. The document outlines the toric IOL implantation procedure and factors affecting postoperative rotation. Toric IOLs can provide high levels of spectacle independence when used appropriately in patients with regular corneal astigmatism over 1.5 D.
Step by step IRIS clip
This document discusses the history and evolution of iris clip intraocular lenses (IOLs). It describes generations of IOL designs from 1949 to present day. Key developments include Binkhorst's iris clip lens in 1965 and Worst's iris claw lens in 1978, which pioneered iris fixation without sutures. Modern iris clip IOLs are made of PMMA or foldable materials, have vaulted designs for clearance, and fixate to the iris periphery for unrestricted pupil function. They are indicated for lens implantation in cases of cataract or aphakia.
Indications & techniques of lens surgery
This document discusses various indications and techniques for lens surgery. It covers two main categories of lens surgery: medical and optical/refractive. Medical indications include lenticular opacification, malposition, malformation, and inflammation. Techniques are discussed such as intracapsular extraction, extracapsular extraction, and phacoemulsification. The history of cataract surgery techniques from ancient times to modern techniques like femtosecond laser-assisted surgery is also summarized. Specific topics like capsulorrhexis, presbyopia surgery, astigmatism correction, and references are also outlined.
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Anophthalmic socket
Anophthalmia is the absence of the eyeball and can be congenital or acquired. The optimal management of an anophthalmic socket involves maintaining adequate volume with a well-positioned implant, healthy conjunctiva, and symmetric eyelids. Complications after enucleation like enophthalmos, eyelid deformities, and socket contracture can be addressed through procedures like dermis fat grafts, fornix deepening sutures, and implant replacement. Proper prosthesis fitting and care is also important for optimal cosmetic and functional results.
Orbital implants
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استشاري طب وجراحة العيون
استشاري جراحة العيون التجميليه
الاردن -عمان
مستشفى العيون التخصصي
Types of iol
Types of intraocular lenses include foldable acrylic and silicone lenses. IOLs are either single piece or multipiece, and have different optic designs like aspheric, toric, or multifocal to correct vision. IOLs are implanted either in the capsular bag or ciliary sulcus, and are made of materials like acrylic, silicone, or hydrogels. Newer accommodating IOL designs aim to restore accommodation.
Ocular viscosurgical devices
The document summarizes ocular viscosurgical devices used in ophthalmic procedures. It discusses the history and ideal properties of viscoelastic substances. Commonly used families include sodium hyaluronate, chondroitin sulfate, and hydroxypropyl methylcellulose. Physical properties like viscosity, pseudoplasticity, and coatability are described. Clinical applications involve cataract surgery, glaucoma surgery, and keratoplasty. Complications from use include increased intraocular pressure and capsular block syndrome.
Glaucoma drainage devices
Glaucoma drainage devices (GDDs) provide an alternative pathway for aqueous humor outflow and are used to treat refractory glaucoma. The document discusses the history, design, and types of various GDDs including non-valved devices like Baerveldt and Molteno implants as well as valved devices like the Ahmed Glaucoma Valve. The key components, materials, and surgical techniques for GDD implantation are also summarized.
Anophthalmic socket
Anophthalmia is the absence of the eyeball and can be congenital or acquired. The optimal anophthalmic socket has a well-positioned implant, healthy conjunctiva, symmetric eyelids, and a comfortable prosthesis. Complications after enucleation include enophthalmos, eyelid deformities, and socket contracture. Management involves orbital implants, dermis fat grafts, fornix deepening, and lid procedures to correct volume deficits and improve prosthesis retention.
Ophthalmic Viscoelastic devices
This document discusses ophthalmic viscosurgical devices (OVDs), including their history, properties, composition, classification, and uses. It begins by describing the introduction of sodium hyaluronate as the first OVD used in ophthalmic surgery in 1972. It then covers the ideal properties of an OVD and the rheological properties of viscosity, elasticity, coatability, and others. OVDs are classified as cohesive, dispersive, or viscoadaptive based on their molecular structure and behavior. The document discusses the advantages and uses of OVDs in cataract surgery, glaucoma surgery, keratoplasty, and other ophthalmic procedures. It concludes by outlining complications like
Sutures & needles in ophthalmology
This document discusses sutures and needles used in ophthalmology. It begins with a brief history of sutures and then defines an ideal suture material. The rest of the document describes the characteristics, types, sizes, and shapes of both absorbable and non-absorbable sutures and needles. It also provides examples of common sutures and needles used for different ophthalmic procedures.
Keratprosthesis
Keratoprosthesis is a surgical procedure where an artificial cornea replaces a severely damaged or diseased natural cornea. It involves implanting an artificial optical cylinder made of clear plastic materials inside the eye with a supporting flange or skirt outside the eye. The Boston KPro is the most commonly used keratoprosthesis device and comes in Type 1 and Type 2 models for different clinical situations. The Osteo-Odonto KPro is a more complex multi-stage procedure that uses the patient's own tooth and surrounding bone to support an artificial cornea for patients with severe dry eye conditions. Keratoprosthesis surgery aims to restore sight for patients with corneal blindness when traditional corneal transplant is not possible or
DSAEK
This document summarizes corneal anatomy and transplantation techniques. It provides an in-depth review of Descemet's stripping automated endothelial keratoplasty (DSAEK), including indications, surgical technique, outcomes, complications, and future directions. DSAEK involves stripping the recipient's Descemet's membrane and inserting a donor posterior corneal graft to treat endothelial dysfunction. It has advantages over penetrating keratoplasty like faster visual recovery and less astigmatism. Complications include graft dislocation and failure. Newer techniques like DMEK may provide better outcomes.
IOL power calculation special situations
IOL power calculation is challenging in eyes with prior refractive surgery or other special situations. In eyes with prior radial keratotomy, standard keratometry overestimates corneal power due to flattening outside the central optical zone. Multiple methods of IOL power calculation should be used, including topography to measure the flattest central corneal power. A study comparing methods in eyes with prior RK found IOL power calculation using topographic keratometry was least accurate compared to formulas from the ESCRS calculator. No single method provided reliable results, highlighting the difficulty in IOL power calculation for eyes with prior refractive surgery.
IOL Selection- What to Ask and What to Tell Patients
This document discusses factors to consider when selecting an intraocular lens (IOL) for cataract surgery. It notes that the patient's visual goals, the surgeon's expertise, and improvements in IOL technology all converge to determine the best IOL choice. Key factors include visual quality, patient expectations and needs, IOL design, and the surgeon's experience. Age-related eye changes and aberrations must also be addressed. Newer "multifocal light" IOLs aim to provide good distance and near vision with fewer side effects compared to traditional multifocal IOLs. The continual goal is high quality vision correction taking into account higher order aberrations like spherical aberration.
Intra ocular lens
An intraocular lens (IOL) is an artificial lens implanted in the eye during cataract surgery or refractive lens exchange to replace the natural crystalline lens and correct vision. IOLs have evolved over generations from rigid PMMA lenses to modern foldable designs made of silicone, acrylic, or hydrogel materials. IOLs are either placed in the posterior chamber behind the iris or in the anterior chamber in front of the iris. Newer multifocal and accommodating IOL designs aim to provide both distance and near vision. Precise biometry is required to calculate the optimal IOL power to achieve the desired postoperative refraction. Potential complications include dislocation, opacification, deposits, and inflammation.
Keratorefractive surgeries
This document discusses keratorefractive surgeries. It begins by describing the anatomy of the cornea, including the epithelium, Bowman's layer, stroma, Descemet's membrane, and endothelium. It then provides a brief history of keratorefractive surgeries and classifications including location, addition, subtraction, relaxation, and compression techniques. Common keratorefractive surgeries discussed include PRK, LASEK, LASIK, epikeratophakia, keratophakia, and excimer laser procedures. Complications, indications, and the role of techniques like corneal topography and wavefront analysis are also summarized.
Nonpenetrating glaucoma surgery
This document discusses non-penetrating glaucoma surgery techniques that facilitate the drainage of aqueous humor through the trabecular meshwork and Schlemm's canal without opening the anterior chamber. It describes several procedures including deep sclerectomy, viscocanalostomy, canaloplasty, ab-externo trabeculectomy, and laser trabecular ablation. The goal is to bypass the highest resistance point to outflow in the juxtacanalicular meshwork. Advantages include lower risks of complications like hypotony compared to penetrating surgeries. Indications and contraindications are provided for various non-penetrating glaucoma procedures.
Congenital infantile esotropia
This document discusses congenital infantile esotropia. It defines esotropia as eyes turning inward and provides background on types. Congenital infantile esotropia is characterized by a large-angle esotropia present before 6 months of age. It may be associated with cerebral palsy or low birth weight. Treatment involves correcting refractive errors, amblyopia therapy, and bilateral medial rectus recession surgery between 6 months to 2 years of age. Post-surgical outcomes include orthophoria, small residual deviations managed with observation, or large residual deviations requiring repeat surgery.
Evolution, types, materials of iol
prepared during lens session
reference :
1) Ophthalmology : Yanoff & Duker : 4th edition.
2) AAO : Section 11 : 2014-2015
Mgmt of pcr
This document discusses posterior capsule tears that can occur during cataract surgery. It covers the predisposing factors, mechanisms, identification, and management strategies for posterior capsule tears with or without vitreous loss. Key points include identifying tears early, stabilizing the anterior chamber with viscoelastic, deciding whether to continue phacoemulsification or convert to extracapsular extraction based on the situation, performing anterior vitrectomy when needed with caution to minimize further vitreous disturbance, and properly placing an IOL. The goal is to remove all lens material and prevent further complications while minimizing additional surgery.
Refractive surprise
This case report describes a patient who experienced refractive surprise following uncomplicated cataract surgery. Axial length measurements from preoperative A-scan were variable, leading to incorrect IOL power calculation. Options for managing refractive surprise include glasses, contact lenses, IOL exchange, piggyback IOL implantation, or corneal refractive surgery. Optical biometry provides more accurate measurements than contact biometry. LASIK is generally the most accurate procedure for correcting residual refractive error, but lens-based procedures are alternatives when excimer laser is unavailable.
Toric iol
This document discusses toric intraocular lenses (IOLs) for correcting astigmatism during cataract surgery. It provides details on the evolution of toric IOL designs from early PMMA lenses that often rotated, to current acrylic models with improved stability. Precise keratometry measurements and accounting for surgically induced astigmatism are important for toric IOL power calculations. The document outlines the toric IOL implantation procedure and factors affecting postoperative rotation. Toric IOLs can provide high levels of spectacle independence when used appropriately in patients with regular corneal astigmatism over 1.5 D.
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This document discusses the history and evolution of iris clip intraocular lenses (IOLs). It describes generations of IOL designs from 1949 to present day. Key developments include Binkhorst's iris clip lens in 1965 and Worst's iris claw lens in 1978, which pioneered iris fixation without sutures. Modern iris clip IOLs are made of PMMA or foldable materials, have vaulted designs for clearance, and fixate to the iris periphery for unrestricted pupil function. They are indicated for lens implantation in cases of cataract or aphakia.
Indications & techniques of lens surgery
This document discusses various indications and techniques for lens surgery. It covers two main categories of lens surgery: medical and optical/refractive. Medical indications include lenticular opacification, malposition, malformation, and inflammation. Techniques are discussed such as intracapsular extraction, extracapsular extraction, and phacoemulsification. The history of cataract surgery techniques from ancient times to modern techniques like femtosecond laser-assisted surgery is also summarized. Specific topics like capsulorrhexis, presbyopia surgery, astigmatism correction, and references are also outlined.
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Congenital cataract
Advances in congenital cataract
leukocoria
Hani Ghaith Hrb
master degree
Ain Shams faculty of medicine
Damanhour ophthalmic hospital
Contact Lens Options In Keratoconus Patients
Keratoconus in detail
Management of keratoconus
All types of contact lenses used in keratoconus
Practical Tips
Summary
Phakic Intraocular lens
Artificial lenses implanted in the anterior or posterior chamber of the eye in the presence of the natural crystalline lens to correct refractive errors. Phakic IOLs an evolving technique in the field of refractive surgery for the correction of moderate to high refractive errors. Patients with high myopia (above -10 diopters) constitute only about 2% of the myopic population but 13-15% of patients presenting for refractive surgery belong to this group. The increased knowledge on anterior segment anatomy and availability of better imaging technologies along with improved IOL designs and surgical techniques have led to higher success rates with these lenses.
Compared to corneal refractive surgery , phakic IOLs compete favorably for the correction of high ametropias, with excellent predictability, efficacy, safety and quality of vision.
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The document discusses intraocular lenses (IOLs), which are artificial lenses implanted during cataract surgery. IOLs have two main parts: an optic, which focuses light on the retina, and haptics, which hold the lens in place. IOLs can be classified based on fixation method (anterior chamber vs posterior chamber), material (rigid vs foldable), focusing ability (unifocal vs multifocal), and special function (toric, aspheric, aniridia lenses). The power of an IOL is calculated using formulas like the SRK formula to account for axial length and corneal curvature. IOLs can be used for primary implantation during cataract surgery or secondary implantation to correct
Intraocular lens
The document summarizes the history and generations of intraocular lenses (IOLs). It discusses the first IOL implanted by Sir Harold Ridley, made of polymethyl methacrylate (PMMA). Later generations included foldable materials, multifocal IOLs, and accommodating IOLs. Premium IOLs now offer features like toric designs to correct astigmatism and aspheric optics for better vision quality. While multifocal IOLs provide simultaneous distance and near vision without glasses, they can cause visual side effects like halos and reduced contrast sensitivity. Accommodating IOLs aim to restore a degree of natural accommodation but may not provide fully unaided near vision for small print.
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This document discusses ocular prosthetics and management of the anophthalmic socket. It begins by describing the surgical procedures of enucleation, evisceration, and exenteration used to partially or completely remove the eye. It then discusses goals and techniques after these surgeries, including the use of conformers and orbital implants. The document outlines fabrication of ocular prosthetics, including custom made versus ready made, and the impression fitting technique. Common complications are listed along with a study on complications. Ideal management is described to provide comprehensive eye care including prosthesis inspection and specialist referrals.
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Intraocular lens
- 2. HISTORICAL ASPECTS PRESENT DAY IOLs Classification Design Material PREMIUM IOLS PHAKIC AND ASPHERIC IOLS COMPLICATIONS RELATED TO IOLs RECENT ADVANCES AND THE FUTURE
- 3. K
- 4. WHAT IS INTRAOCULAR LENS? • An artificial lens implanted in the eyes • Replaces the crystalline lens • Tocorrect the optical power of the eyes following:- Lens being clouded by cataract Refractive surgery
- 5. PARTS OF AN IOL • OPTIC Part of the lens that focuses light on the retina. • HAPTIC Small filaments connected to the optic that hold the lens in place in the eye HAPTEN OPTIC
- 6. PARTS OF AN IOL • OPTIC Part of the lens that focuses light on the retina. • HAPTIC Small filaments connected to the optic that hold the lens in place in the eye HAPTEN OPTIC
- 7. PARTS OF AN IOL • OPTIC Part of the lens that focuses light on the retina. • HAPTIC Small filaments connected to the optic that hold the lens in place in the eye HAPTEN OPTIC
- 9. FIRST GENERATION IOLS
- 10. SECOND GENERATION IOLS Rigid and semi-rigid anterior chamber IOLs the anterior chamber, with fixation of the lens in the angle recess Baron, in France, is generally credited as being the first designer and implanter of an anterior chamber lens ADVANTAGES • Less decenteration • Decreased reaction DISADVANTAGES • Corneal decompensation • Pseudophakic Bullous keratopathy • Uveitis • Secondary glaucoma
- 11. THIRD GENERATION IOLS Iris suppoted lens Cornelius Binkhorst, Iris clip lens; four-loop (1957) Iridocapsular fixation; two loop (1965) ADVANTAGES • Away from angle structures • Rate of dislocation was less • Less contact with corneal endothelium DISADVANTAGES • Iris chaffing • Pupillary distortion • Transillumination defects • Chronic inflammation • CME • Distortion on pupillary dilatation • Endothelial decompensation
- 12. FOURTH GENERATION IOLS Intermediate ACIOL Flexible loops with multiple point of fixation More stable Advantages – more stable, better design, less complications Disadvantages – anterior chamber is not the physiological site for IOL
- 13. FIFTH GENERATION IOLS PMMA lenses Rigid posterior chamber IOL Sixth generation IOLs Foldable IOL Seventh generation IOLs Multifocal IOL Eighth generation IOLs Accomodative IOL Phakic refractive IOL
- 15. CLASSIFICATION Complications of anesthesia General anesthesia Regional / Local anesthesia Intraoperative Early postoperative Late postoperative
- 17. PERIBULBAR / RETROBULBAR ANESTHESIA Lids trauma (ecchymosis) Ptosis s/conj hemorrhage Muscles damage Globe penetration & its related complications Retrobulbar hemorrhage Optic nerve damage Putscher-type retinopathy * Brainstem anesthesia
- 18. RETROBULBAR HEMORRHAGE Common complication Causes proptosis & raised IOP Incidence of severe RBH = 0-3% Reported case of CRAO * Management Continue with surgery if minimal Lateral canthotomy for severe cases