From Kahook's Essentials Of Glaucoma Therapy

A directory of videos

Surgical Videos

  • Ahmed ClearPath 250 Implantation

    Dr. Leonard Seibold performs an Ahmed ClearPath 250 implantation

  • Dr. Bac Nguyen performs excisional goniotomy with KDB

    Inside-Out technique for excisional goniotomy with KDB in a patient with highly pigmented trabecular meshwork

  • Filament Trabeculotomy vs Excisional Goniotomy

    This study explores clinical outcomes post filament trabeculotomy vs excisional goniotomy

  • Repair of Conjunctival Erosion Over Tube (Glaucoma Drainage Device)

    A focal erosion of conjunctiva over the tube portion of a glaucoma drainage device was noted during routine patient follow-up

  • Compression sutures for over-filtering bleb

    Drs. Cara Capitena and Malik Kahook perform compression sutures to limit the surface area of an over-filtering bleb

  • Goniosynechialysis (GSL) prior to Excisional Goniotomy with the Kahook Dual Blade

    Drs. Monica Ertel and Leonard Seibold use the NGENUITY System from Alcon to visualize the angle and perform GSL with the heel of the KDB prior to performing an excisional goniotomy

  • Tube Extension Procedure by Drs. Cara Capitena Young and Leo Seibold

    Drs. Cara Capitena Young and Leo Seibold illustrate tube extension surgery after the original tube is transected and found to be too short to access the anterior chamber

  • Dr Cara Capitena Young Demonstrates Implantation of the Ahmed Glaucoma Valve

    Dr. Cara Capitena Young (Assistant Professor of Ophthalmology at the University of Colorado SOM) demonstrates implantation of the Ahmed Glaucoma Valve with captions highlighting key steps.

  • Bleb Revision with the Grover Fellman Sclerostomy Spatula (Malik Y. Kahook, MD)

    There are many ways to perform bleb revision procedures with the traditional technique involving conjunctival dissection and breaking scar tissue that limits aqueous drainage. The technique in this video is an alternative approach that relies on a recently introduced tool, the Grover Fellman Sclerstomy Spatula.

  • What is Stuck in the IA Port? (Malik Y. Kahook, MD)

    This case was presented to emphasize the step of ensuring the entire anterior capsular material is removed at the conclusion of the Rhexis.

  • Repair of Conjunctival Hole Post Glaucoma Drainage Device Implantation (Malik Y. Kahook, MD)

    This case involved a conjunctival hole that occurred a few weeks after primary implantation of a glaucoma drainage device. The hole was caused by the vicryl knot overlying the silicone tube. AMT was used for the repair and I share some pearls for practice with thoughts on possible alternative approaches. I welcome thoughts on how you would approach this case.

  • Ab Interno Removal of EX-PRESS Device (Malik Y. Kahook, MD)

    This is a short video to show one technique for ab interno EX-PRESS Glaucoma Filtration Device removal through a clear corneal incision. Cataract surgery was completed first prior to turning attention to the EX-PRESS device.

  • Cataract Extraction + Canaloplasty in Setting of Long Anterior Zonules (Malik Y. Kahook, MD)

    This is a case of long anterior zonular syndrome leading to pigment dispersion glaucoma. It was decided that the patient required cataract extraction and we decided to perform concomitant STREAMLINE® SURGICAL SYSTEM Canaloplasty to decrease intraocular pressure.


  • Goniosynechialysis Lecture (Malik Y. Kahook, MD)

    Dr. Kahook lectures on various techniques for performing goniosynechialysis with instructional videos and pearls for practice.

  • Visual Field Testing Lecture

    Drs. Kahook, Seibold and SooHoo lecture on various methods of visual field testing and pearl for interpretation

  • Adherence to Glaucoma Therapy Part I (Malik Y. Kahook, MD)

    This lecture is Part I of a two part series covering limitations and opportunities involving adherence to glaucoma therapy.

  • Adherence to Glaucoma Therapy Part II (Malik Y. Kahook, MD)

    This lecture is Part II of a two part series covering limitations and opportunities involving adherence to glaucoma therapy.

  • Medical Treatment of Glaucoma Part I with Cara Capitena Young, MD

    This lecture is Part I of III covering the available options for the topical and oral treatment of glaucoma.

  • Medical Treatment of Glaucoma Part II with Cara Capitena Young, MD

    This lecture is Part II of III covering the available options for the topical and oral treatment of glaucoma.

  • Medical Treatment of Glaucoma Part III with Cara Capitena Young, MD

    This lecture is Part III of III covering the available options for the topical and oral treatment of glaucoma.

  • Glaucoma Therapy in the Setting of Pregnancy and Breastfeeding (Malik Y. Kahook, MD)

    This lecture covers the basics of treating pregnant and breastfeeding patients who suffer from glaucoma with a focus on medical therapy.

  • Tube Extension Techniques for Glaucoma Drainage Devices (Malik Y. Kahook, MD)

    This lecture focuses on techniques for tube extension with glaucoma drainage devices. The technique for tube extension with a 22-gauge angiocatheter is presented using surgical video followed by a discussion of alternative techniques. Contributors include Leonard Seibold, MD Cara Capitena Young MD and Monica Ertel MD.

  • Managing Endothelial Cell Loss after MIGS Procedures (Malik Y. Kahook, MD)

    This lecture covers the basics of endothelial cell loss with a focus on micro-invasive glaucoma surgery (MIGS) implants. A case of CyPASS removal post endothelial cell loss is presented along with recommendations from the ASCRS Task force formed post recall of the CyPASS device from the market.

  • New Medications in the Pipeline for the Treatment of Glaucoma (Malik Y. Kahook, MD)

    This lecture covers medications that have been recently approved for use in the United States and in multiple markets around the globe. Medications discussed include Rhopressa, Rocklatan and Vyzulta. Each section includes information on mechanism of action, clinical data (including efficacy and adverse events) and my opinion on how best to use these medications in clinical practice.

  • Reticular Bullous Epithelial Edema With ROCK Inhibitor Therapy (Malik Y. Kahook, MD)

    This lecture covers the recently recognized reticular bullous epithelial edema in corneas treated With ROCK inhibitors. Topics covered include mechanism of action of ROCK inhibitors and a discussion of published literature detailing this phenomenon with photographic examples.

  • Surgical Management of Glaucoma in Setting of Concurrent Anti-VEGF Treatment of Wet AMD (Malik Y. Kahook, MD)

    Would you do a Trab or a Tube? This patient has glaucoma requiring surgical management and the referring retina doctor advises that continued Anti-VEGF intra-vitreal injections will be needed long-term to treat co-existing wet AMD. How would you proceed?

  • Should You Prescribe Statins for Your Glaucoma Patient? (Malik Y. Kahook, MD)

    The benefit of using oral statin therapy for patients suffering from glaucoma is controversial. This lecture covers data from evidence based medicine and offers some suggestions on how to discuss the pros and cons with patients.

  • Managing the Diffuse Bleb (Malik Y. Kahook, MD)

    Diffuse blebs may cause low intraocular pressure and/or discomfort (bleb dysesthesia). Various methods can be used to limit bleb area and decrease overall height. This lecture presents three techniques for management of the diffuse bleb that can be used sequentially when initial interventions fail to address the problem.

  • What is your preferred method for performing a capsulorhexis? (Malik Y. Kahook, MD)

    The manual continuous curvilinear capsulorhexis is the most common technique used for completing a rhexis at time of cataract surgery. Newer methods, including laser and thermal based techniques, have emerged as potential replacement for the manual freehand technique. This video discusses several methods used for completion of a rhexis while detailing the pros and cons of each. Which method do you use?

  • Kahook Dual Blade Excisional Goniotomy (Malik Y. Kahook, MD)

    This lecture covers basic techniques and clinical utility of KDB excisional goniotomy in patients with various types of glaucoma.

  • The 5 Rs of Examining the Optic Disc (Malik Y. Kahook, MD)

    This lecture covers the basics of examining the optic disc using the 5Rs. While a great deal of knowledge has been gained since the first introduction of the FORGE I lecture, I still find this information valuable for both trainees as well as seasoned eye care professionals. I tried to follow the original transcript as closely as I could with some minor additions.

  • Laser Peripheral Iridotomy: Tips and Tricks (Malik Y. Kahook, MD)

    This lecture covers the basics of performing LPI with different lasers as well as a discussion of potential complications and how to avoid poor outcomes.

  • Cyclophotocoagulation Part I: Trans-scleral Cyclophotocoagulation (Malik Y. Kahook, MD)

    This lecture covers transscleral cyclophotocoagulation including mechanism of action and tips for clinical practice.

  • Cyclophotocoagulation Part II: Endocyclophotocoagulation (Malik Y. Kahook, MD)

    This is Part II on Cyclophotocoagulation with a focus on tips and tricks for Endocyclophotocoagulation (ECP). A few publications are discussed briefly along with pearls for post-operative management.

  • Selective Laser Trabeculoplasty: Tips and Tricks (Malik Y. Kahook, MD)

    This lecture covers the basics of performing selective laser trabeculoplasty (SLT) as well as a discussion of indications, contraindications and clinical study findings.

  • Normal (Low) Tension Glaucoma (Malik Y. Kahook, MD)

    Whether you call it "normal" or "low" tension glaucoma, this lecture should be of benefit to medical students, residents/fellows and anybody who wants to refresh basic knowledge. Topics that are covered include when to order brain imaging and how to handle patients with progressive glaucoma despite very low intraocular pressure.

  • Goniosynechialysis: Tips and Tricks (Malik Y. Kahook, MD)

    This video covers basic techniques for successful completion of goniosynechialysis (GSL) with Tips and Tricks for success. Surgical videos are utilized to illustrate various techniques by different surgeons.

  • Translational Research: Tips from The Trenches (Malik Y. Kahook, MD)

    This lecture covers some thoughts on the innovation pathway. Example technologies from the University of Colorado are used to illustrate the various routes from bench to bedside.

  • Cataract Surgery as an IOP Lowering Procedure (Malik Y. Kahook, MD)

    This lecture covers the basic mechanisms of IOP lowering post cataract extraction. Several clinical trials are discussed with emphasis on how evidence based medicine can drive our surgical decision making process.

  • What is Going on Here? (Malik Y. Kahook, MD)

    This is a unique case of traumatic ciliary body cleft formation with episodic bleeding from a torn iris vessel. The interesting aspect was the lack of layered hyphema (with blood collecting in the cleft rather than in the anterior chamber) and the episodic nature of the bleeding due to reversible plugging of the cleft by iris tissue.

  • A Case of Pseudophakic Pupillary Block (Malik Y. Kahook, MD)

    This is a case that my partner Leo Seibold saw when he was a resident in 2009. Several of our team members cared for this patient. While a rare event, I think it might be of interest with a few pearls for how to address such cases.

  • Traumatic Glaucoma (Malik Y. Kahook, MD)

    Traumatic glaucoma is any form of glaucoma that results directly from injury to the eye. Some causes include blunt trauma with direct damage to the aqueous outflow system, Penetrating injuries leading to disruption of tissues with inflammation and scar formation, retinal detachment with subsequent plugging of the trabecular meshwork with blood or inflammatory cells (or photoreceptors), bleeding with compromise of the outflow system as well as exposure to caustic substances.

  • Towards Constant Measurement of IOP (Malik Y. Kahook, MD)

    This is an introductory lecture on 24hr IOP with discussions centered on pressure fluctuations and devices used for monitoring IOP. The content is best suited for medical students, residents and fellows. Practicing ophthalmologists may benefit from this basic review as well.

  • Ab Interno Repair of Cyclodialysis Cleft (Malik Y. Kahook, MD)

    This video illustrates one way of doing ab interno cyclopexy using a 10-0 prolene suture while minimizing tissue manipulation. This patient experienced blunt trauma to the eye with resultant cyclodialysis cleft and hypotony. She recovered well after surgery with normalization of eye pressure and maintained 20/20 vision.

  • Point-2-Point with Dr. Malik Y. Kahook - Glaucoma Drainage Devices: Tips and Tricks

    This session covers both traditional and novel glaucoma drainage devices with a focus on practical information to improve intraoperative techniques and postoperative outcomes. Videos and a case-based teaching approach are utilized along with questions and answers both during and at the end of the webinar.

  • Epidemiology of Glaucoma (Malik Y. Kahook, MD)

    This short video covers basic information on the epidemiology of glaucoma.

  • Artificial Intelligence in Ophthalmology and Oculomics (Malik Y. Kahook, MD)

    The goal of this video is to introduce basic concepts and terminology related to artificial intelligence (AI) and to succinctly touch on noteworthy publications that can help guide further exploration if you want to take a deeper dive.


    This lecture covers my thought process when combining glaucoma surgery in eyes with pseudoexfoliation undergoing concomitant cataract extraction. Leveraging angle procedures (MIGS) such as goniotomy surgery can both lower pressure and decrease dependence on pressure lowering drops.

  • Climate Change and Eye Health (Malik Y. Kahook, MD)

    Climate change is a powerful force that increasingly influences the way we care for patients. Eye related diseases such as glaucoma and macular degeneration will increase in frequency due to pollution and other climate related factors and this increase will be compounded by the overall aging population. This talk covers the basics of how climate change might influence ophthalmic care globally and touches on a few ways we can decrease the overall impact of a warming planet on our patient population.

  • Global Ophthalmology and Sustainable Glaucoma Interventions. (Malik Y. Kahook, MD)

    This is a talk I gave for The Central American Congress of Residents. The focus of the talk is on Global Ophthalmology and Sustainable Glaucoma Interventions.

1 Slide in 5 Minutes Lecture Series

  • What is Glaucoma? (Malik Y. Kahook, MD)

    Welcome to a new series called “1Slide in 5Minutes” where we will present no more than one content slide and will always keep it at 5minutes or less. The first question to start with is maybe a bit too ambitious, “What is Glaucoma?” The answer is intended to be appropriate for patients, medical students and residents.

  • Summary of the Laser in Glaucoma and ocular HyperTension (LiGHT) Study- (Malik Y. Kahook, MD)

    This "1 Slide in 5 Minutes" lecture covers the basics of the initial Laser in Glaucoma and ocular HyperTension (LiGHT) Study publication as well as two follow up studies with important clinically relevant information.

  • Pseudoexfoliation (Malik Y. Kahook, MD)

    This edition of 1 Slide 5 Minutes covers the basics of pseudoexfoliation and is appropriate for medical students, residents and those seeking to refresh basic knowledge.

  • Pigment Dispersion Syndrome and Pigmentary Glaucoma (Malik Y. Kahook, MD)

    This edition of 1 Slide in 5 Minutes covers the basics of Pigment Dispersion Syndrome and Pigmentary Glaucoma. The content is intended for medical students, residents and those seeking to refresh basic knowledge. Industry members may also find the content informative.

  • Phacolytic Glaucoma (Malik Y. Kahook, MD)

    Phacolytic glaucoma is a form of secondary open angle glaucoma that is related to leakage of high molecular weight proteins through microscopic openings in the capsule of a hypermature cataract. The image of the morgagnian cataract is from at the University of Iowa.

  • Lens Particle Glaucoma (Malik Y. Kahook, MD)

    Lens Particle Glaucoma results from liberated cataract material after the lens capsule is compromised post cataract surgery or post trauma.

  • Phacoantigenic Glaucoma (Malik Y. Kahook, MD)

    Phacoantigenic Glaucoma involves granulomatous inflammation resulting from sensitization to lens proteins post cataract surgery or trauma.

  • Glaucoma and Intraocular Tumors (Malik Y. Kahook, MD)

    This lecture covers glaucoma associated with intraocular tumors. Mechanism of IOP elevation, diagnosis and treatment methods are discussed.

  • Fuchs' Heterochromic Iridocyclitis (Malik Y. Kahook, MD)

    Fuchs’ Heterochromic Iridocyclitis, also known as Fuchs’ Heterochromic Cyclitis, presents as a chronic unilateral uveitis in young to middle aged people with no race or sex predilection. This lecture covers the basics of clinical presentation and treatment.

  • Angle Recession Glaucoma (Malik Y. Kahook, MD)

    Angle Recession of the anterior chamber angle occurs secondary to concussive ocular trauma.

  • Uveitis-Glaucoma-Hyphema Syndrome (Malik Y. Kahook, MD)

    Uveitis-Glaucoma-Hyphema Syndrome is classically associated with the triad of chronic inflammation, recurrent bleeding and iris transillumination defects. Elevated intraocular pressure is noted with advancing dysfunction of the trabecular meshwork and is occasionally associated with iris neovascularization and cystoid macular edema.

  • Glaucomatocyclitic Crisis (Malik Y. Kahook, MD)

    Glaucomatocyclitic crisis, also known as Posner and Schlossman Syndrome, is an acute, unilateral disease process with mild anterior chamber inflammation and elevation of intraocular pressure (IOP) that is recurrent.

  • Neovascular Glaucoma (Malik Y. Kahook, MD)

    Neovascular Glaucoma (NVG) presents as a secondary open-angle or secondary closed-angle glaucoma, depending on the extent of fibrovascularization and synechiae formation in the drainage angle. The abnormal vessels form in response to ischemia of the retina and are composed of highly permeable thin walls (lacking a muscular layer or normal adventitia) with absence of tight intercellular junctions.

  • Iridocorneal Endothelial (ICE) Syndrome (Malik Y. Kahook, MD)

    ICE Syndrome is a group of corneal diseases that have in common corneal endothelial pathology, iris atrophy and in many cases, secondary angle closure glaucoma. It has been my clinical experience that most ICE syndrome patients present with subtle disease that is managed with topical therapy and regular follow-up.

  • Malignant Glaucoma (Malik Y. Kahook, MD)

    Malignant glaucoma is a relatively rare form of secondary angle closure glaucoma often correlating with intraocular surgery in eyes with narrow angles or synechial closure, although it can occur in open angles and even post non-invasive laser procedures like cyclophotocoagulation and laser iridotomy.

  • Plateau Iris Syndrome (Malik Y. Kahook, MD)

    Plateau Iris Syndrome is a form of angle closure more common in younger female patients. The pathology is thought to be due to anteriorly positioned ciliary processes pushing the peripheral iris forward leading to angle closure. A double hump sign is seen on indentation gonioscopy.

  • Long Anterior Zonules (Malik Y. Kahook, MD)

    Long Anterior Zonules (LAZ) are characterized by zonular fibers that extend more central than usual on the anterior lens capsule (normal insertion is about 1.5-2 mm anterior to equator).