SRK/T power of +4D is more accurate for this patient since their axial length is within the normal range where third generation formulas like SRK/T are more accurate than second generation formulas like SRK II.
A 20-year-old Saudi female presented with progressive gradual loss of vision in both eyes over two years. Examination found VA of 6/9 in the right eye and 6/18 in the left. Signs of keratoconus were seen including stromal thinning, Vogt's striae, and Munson's sign. Topography showed patterns characteristic of keratoconus such as inferior steepening and asymmetric bowtie patterns. She was diagnosed with keratoconus stage 2 based on findings. Contact lenses were recommended for management as spectacles could not adequately correct her vision.
- Retinal artery macroaneurysms (RAMs) are fusiform or saccular dilatations of the retinal arteries that commonly cause macular exudation and hemorrhage, resulting in decreased vision.
- RAMs predominantly affect hypertensive females over 60 years of age and can be asymptomatic or cause vision loss from leakage, hemorrhage, or cystoid macular edema.
- Treatment may include observation, laser photocoagulation to reduce leakage from the RAM, or anti-VEGF injections to decrease vascular permeability and exudation. Most RAMs have a good visual prognosis with these treatments or spontaneous involution.
Доклад на Пятой научно-практической конференции с международным участием «Основные тенденции в современной офтальмологии», организованной клиникой профессора Эскиной Э.Н. «Сфера», совместно с кафедрой офтальмологии ФГБОУ ДПО ИПК ФМБА России —→ http://www.sfe.ru/information/ophthalmology-news/conference2015.html
This document provides an overview of a course on using femtosecond lasers for cataract and astigmatism surgery. It discusses the LenSx laser, which was the first femtosecond laser cleared by the FDA for use in cataract surgery. The LenSx laser allows for precise cuts to the anterior capsule, lens fragmentation, and corneal incisions through integrated OCT imaging and a curved patient interface. Studies show benefits like improved capsulotomy accuracy and consistency compared to manual techniques.
SRK/T power of +4D is more accurate for this patient since their axial length is within the normal range where third generation formulas like SRK/T are more accurate than second generation formulas like SRK II.
A 20-year-old Saudi female presented with progressive gradual loss of vision in both eyes over two years. Examination found VA of 6/9 in the right eye and 6/18 in the left. Signs of keratoconus were seen including stromal thinning, Vogt's striae, and Munson's sign. Topography showed patterns characteristic of keratoconus such as inferior steepening and asymmetric bowtie patterns. She was diagnosed with keratoconus stage 2 based on findings. Contact lenses were recommended for management as spectacles could not adequately correct her vision.
- Retinal artery macroaneurysms (RAMs) are fusiform or saccular dilatations of the retinal arteries that commonly cause macular exudation and hemorrhage, resulting in decreased vision.
- RAMs predominantly affect hypertensive females over 60 years of age and can be asymptomatic or cause vision loss from leakage, hemorrhage, or cystoid macular edema.
- Treatment may include observation, laser photocoagulation to reduce leakage from the RAM, or anti-VEGF injections to decrease vascular permeability and exudation. Most RAMs have a good visual prognosis with these treatments or spontaneous involution.
Доклад на Пятой научно-практической конференции с международным участием «Основные тенденции в современной офтальмологии», организованной клиникой профессора Эскиной Э.Н. «Сфера», совместно с кафедрой офтальмологии ФГБОУ ДПО ИПК ФМБА России —→ http://www.sfe.ru/information/ophthalmology-news/conference2015.html
This document provides an overview of a course on using femtosecond lasers for cataract and astigmatism surgery. It discusses the LenSx laser, which was the first femtosecond laser cleared by the FDA for use in cataract surgery. The LenSx laser allows for precise cuts to the anterior capsule, lens fragmentation, and corneal incisions through integrated OCT imaging and a curved patient interface. Studies show benefits like improved capsulotomy accuracy and consistency compared to manual techniques.
Indications & techniques of lens surgeryBipin Bista
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.
- 86 year old patient presented with headache and severe eye pain 9 days after complete blindness in one eye following ocular surgery
- Exam found corneal edema, shallow anterior chamber, and no view of fundus in the affected eye
- Ultrasound showed suprachoroidal hemorrhage, and the plan was for retina service to consult and revise the shunt and scleral graft with drainage of the hemorrhage.
The document discusses regression following LASIK surgery. It summarizes a study examining the effects of epithelial and biomechanical changes on refractive outcomes after LASIK. The study found that these changes accounted for inaccuracies in LASIK treatment. It also determined that diagnosing regression requires analysis of layered corneal changes after LASIK using techniques like ultrasound, and that directly measuring flap and stromal thickness is important for safety when considering enhancement procedures.
This document discusses the differences between DSAEK and DMEK endothelial keratoplasty procedures. DMEK, where the donor tissue is thinner than DSAEK, provides better visual outcomes but is more technically challenging to perform due to the delicate tissue handling required. DSAEK is easier to perform but results in slightly worse vision initially. Long term graft survival is similar between the two procedures, though DMEK has lower rejection rates while DSAEK has fewer intraoperative complications. The document examines factors related to tissue preparation, surgical technique, patient anatomy, and postoperative outcomes when comparing DSAEK to DMEK.
Keraring intracorneal ring segments are designed to treat keratoconus and other corneal ectatic disorders. They work by remodeling the cornea to regularize its surface and reduce refractive errors through addition techniques. Keraring comes in different sizes and thicknesses to customize treatment and provides long-term stabilization and improvement in vision. Extensive clinical use has demonstrated its safety and effectiveness for correcting refractive errors.
Corneal edema after cataract surgery - MALEK AL KOTTMalek Al Kott
This document summarizes the structure and function of the cornea, with a focus on the endothelium and causes of corneal edema. It discusses the cornea's five layers, with details on the endothelium and its pump functions. Causes of corneal edema include loss of endothelial cells from aging, surgery, diseases like Fuchs endothelial dystrophy, intraoperative injuries from instruments or ultrasound, and postoperative issues like glaucoma or toxic anterior segment syndrome. The document also outlines examination techniques for the cornea like slit lamp, specular microscopy, and pachymetry.
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.
This document discusses post-LASIK ectasia, a rare complication where the cornea progressively steepens and thins after refractive surgery. It identifies risk factors for ectasia like pre-operative topographic patterns, residual stromal bed thickness under 250 microns, young patient age, thin corneas, and high degrees of myopia. Ectasia diagnosis involves inferior steepening of 5D or more, loss of 2 lines of acuity, or a change in refraction of 2D or more. Management options aim to restore vision and stop progression, including corneal crosslinking, intracorneal rings, and keratoplasty. Careful preoperative evaluation can help prevent this complication.
This document discusses various types of corneal degenerations and dystrophies. It provides descriptions of conditions such as arcus senilis, band keratopathy, corneal dystrophies, and corneal depositions. The causes, characteristics, associated systemic diseases, histopathological features, and treatments are summarized for each condition.
The slides from the first three talks of Dioptric Distress, an instruction course conducted at the Annual Conference of the Delhi Ophthalmological Society in April 2016
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.
This document discusses epiretinal membrane (ERM), a fibrocellular membrane that forms on the inner surface of the retina. It causes varying degrees of macular dysfunction. ERM can be idiopathic or secondary to conditions like retinal detachment repair. Symptoms include vision loss and metamorphopsia. Diagnosis is usually clinical but OCT and FFA can help. Treatment is usually vitrectomy to peel the membrane if it is causing visual symptoms. Outcomes are generally good with most patients improving, but recurrence or worse vision is possible.
Keratoconus is a non-inflammatory thinning and protrusion of the cornea that results in impaired vision. It typically begins at puberty and progresses slowly over 10-20 years before stabilizing. Diagnosis involves examining for signs like Munson's sign, Fleischer's ring, and irregular astigmatism using tools like retinoscopy, keratometry, and corneal topography. Treatment begins with glasses or contact lenses and may progress to corneal grafting for advanced cases.
[1] Ocular Surface Squamous Neoplasia (OSSN) refers to a spectrum of dysplastic and malignant squamous lesions of the conjunctiva and cornea.
[2] Diagnosis is usually clinical but can be confirmed with biopsy. For suspected OSSN less than 3 clock hours, excision biopsy with cryotherapy and alcohol epitheliectomy is performed. Larger lesions may require chemoreduction with topical chemotherapy prior to surgery and cryotherapy.
[3] Risk factors include ultraviolet light, HIV, and human papillomavirus. While rare, metastasis can occur to local lymph nodes or distant sites like lungs. Recurrence after treatment ranges from 15-52% depending
Lasik Complications 2001 Diffuse Lamellar Keratitis by Dr. Jeffery MachatMachat LASIK
Three primary post-operative complications of LASIK surgery are discussed: Diffuse Lamellar Keratitis (DLK), Epithelial Ingrowth, and Corneal Striae. DLK is an inflammatory reaction in the corneal interface that can range from mild to severe, affecting vision and refractive error. It is graded on a scale of 1 to 3 based on its severity and treated with topical steroids. Epithelial Ingrowth involves the growth of epithelial cells into the interface, while Corneal Striae are lines in the cornea caused by melting during DLK.
Indications & techniques of lens surgeryBipin Bista
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.
- 86 year old patient presented with headache and severe eye pain 9 days after complete blindness in one eye following ocular surgery
- Exam found corneal edema, shallow anterior chamber, and no view of fundus in the affected eye
- Ultrasound showed suprachoroidal hemorrhage, and the plan was for retina service to consult and revise the shunt and scleral graft with drainage of the hemorrhage.
The document discusses regression following LASIK surgery. It summarizes a study examining the effects of epithelial and biomechanical changes on refractive outcomes after LASIK. The study found that these changes accounted for inaccuracies in LASIK treatment. It also determined that diagnosing regression requires analysis of layered corneal changes after LASIK using techniques like ultrasound, and that directly measuring flap and stromal thickness is important for safety when considering enhancement procedures.
This document discusses the differences between DSAEK and DMEK endothelial keratoplasty procedures. DMEK, where the donor tissue is thinner than DSAEK, provides better visual outcomes but is more technically challenging to perform due to the delicate tissue handling required. DSAEK is easier to perform but results in slightly worse vision initially. Long term graft survival is similar between the two procedures, though DMEK has lower rejection rates while DSAEK has fewer intraoperative complications. The document examines factors related to tissue preparation, surgical technique, patient anatomy, and postoperative outcomes when comparing DSAEK to DMEK.
Keraring intracorneal ring segments are designed to treat keratoconus and other corneal ectatic disorders. They work by remodeling the cornea to regularize its surface and reduce refractive errors through addition techniques. Keraring comes in different sizes and thicknesses to customize treatment and provides long-term stabilization and improvement in vision. Extensive clinical use has demonstrated its safety and effectiveness for correcting refractive errors.
Corneal edema after cataract surgery - MALEK AL KOTTMalek Al Kott
This document summarizes the structure and function of the cornea, with a focus on the endothelium and causes of corneal edema. It discusses the cornea's five layers, with details on the endothelium and its pump functions. Causes of corneal edema include loss of endothelial cells from aging, surgery, diseases like Fuchs endothelial dystrophy, intraoperative injuries from instruments or ultrasound, and postoperative issues like glaucoma or toxic anterior segment syndrome. The document also outlines examination techniques for the cornea like slit lamp, specular microscopy, and pachymetry.
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.
This document discusses post-LASIK ectasia, a rare complication where the cornea progressively steepens and thins after refractive surgery. It identifies risk factors for ectasia like pre-operative topographic patterns, residual stromal bed thickness under 250 microns, young patient age, thin corneas, and high degrees of myopia. Ectasia diagnosis involves inferior steepening of 5D or more, loss of 2 lines of acuity, or a change in refraction of 2D or more. Management options aim to restore vision and stop progression, including corneal crosslinking, intracorneal rings, and keratoplasty. Careful preoperative evaluation can help prevent this complication.
This document discusses various types of corneal degenerations and dystrophies. It provides descriptions of conditions such as arcus senilis, band keratopathy, corneal dystrophies, and corneal depositions. The causes, characteristics, associated systemic diseases, histopathological features, and treatments are summarized for each condition.
The slides from the first three talks of Dioptric Distress, an instruction course conducted at the Annual Conference of the Delhi Ophthalmological Society in April 2016
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.
This document discusses epiretinal membrane (ERM), a fibrocellular membrane that forms on the inner surface of the retina. It causes varying degrees of macular dysfunction. ERM can be idiopathic or secondary to conditions like retinal detachment repair. Symptoms include vision loss and metamorphopsia. Diagnosis is usually clinical but OCT and FFA can help. Treatment is usually vitrectomy to peel the membrane if it is causing visual symptoms. Outcomes are generally good with most patients improving, but recurrence or worse vision is possible.
Keratoconus is a non-inflammatory thinning and protrusion of the cornea that results in impaired vision. It typically begins at puberty and progresses slowly over 10-20 years before stabilizing. Diagnosis involves examining for signs like Munson's sign, Fleischer's ring, and irregular astigmatism using tools like retinoscopy, keratometry, and corneal topography. Treatment begins with glasses or contact lenses and may progress to corneal grafting for advanced cases.
[1] Ocular Surface Squamous Neoplasia (OSSN) refers to a spectrum of dysplastic and malignant squamous lesions of the conjunctiva and cornea.
[2] Diagnosis is usually clinical but can be confirmed with biopsy. For suspected OSSN less than 3 clock hours, excision biopsy with cryotherapy and alcohol epitheliectomy is performed. Larger lesions may require chemoreduction with topical chemotherapy prior to surgery and cryotherapy.
[3] Risk factors include ultraviolet light, HIV, and human papillomavirus. While rare, metastasis can occur to local lymph nodes or distant sites like lungs. Recurrence after treatment ranges from 15-52% depending
Lasik Complications 2001 Diffuse Lamellar Keratitis by Dr. Jeffery MachatMachat LASIK
Three primary post-operative complications of LASIK surgery are discussed: Diffuse Lamellar Keratitis (DLK), Epithelial Ingrowth, and Corneal Striae. DLK is an inflammatory reaction in the corneal interface that can range from mild to severe, affecting vision and refractive error. It is graded on a scale of 1 to 3 based on its severity and treated with topical steroids. Epithelial Ingrowth involves the growth of epithelial cells into the interface, while Corneal Striae are lines in the cornea caused by melting during DLK.
Lasik Complications 2001 Epithelial Ingrowth by Dr. Jeffery MachatMachat LASIK
The document discusses three primary post-operative complications: epithelial ingrowth, corneal striae, and diffuse lamellar keratitis. It focuses on epithelial ingrowth, describing Machat's grading system of 1 to 3 based on appearance and severity, with grade 3 having gray necrotic geographic cell nests and potential flap melting. Treatment involves cleaning the corneal interface.
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.
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Urgence ophtalmologique pour le médecin de premier recoursBijan Farpour
Cette présentation couvre une partie des urgence ophtalmologique pour le médecin de premier recours.
Elle couvre l'oeil rouge traumatique et non traumatique ainsi que les urgences à référer.
Similaire à Complications postopératoires du LASIK (20)
23. Stade 1 Infiltrats limités à un secteur de la périphérie de l’interface Stade 2 Infiltrats intéressant toute l’interface Stade 3 Infiltrats plus denses Stade 4 Infiltrats très denses + réaction nécrotique puis cicatricielle dans l’axe optique 1/30 1/200 1/500 1/5000
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26. TRAITEMENT PRECOCE Fonction de l ’intensité de la réaction inflammatoire Stade 1 et 2: auto-limités Guérit en moins de 10 jours Corticothérapie: déxaméthasone 1% 1 goutte/heure puis décroissance sur 5 jours Stade 3: Corticothérapie Lavage de l’interface à J 2 ou J 3 , irriguer avec BSS Ablation dépôts avec éponge humide: prélèvement microbio Stade 4: Lavage très prudent (?), peu bénéfique car tissus fragilisés Mais : prélèvement microbio Collyres antibiotiques fortifiés systématiques ? SOS ou Infection ?
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35. Fiabilité de la mesure à l’ORBSCAN : dans les conditions extra-physiologiques : 1- influence de la surface antérieure (xie réfractive, greffe, kératocône) 2- influence de l’indice de réfraction et de l’interface Fiabilité de la mesure aux ultra sons : sous estimation de 20 à 26 microns par rapport aux mesures interférométriques