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1 General aspects (0)   1.1 Epidemiology (4)   1.2 Population genetics (1)   1.3 Pathogenesis (4)   1.4 Quality of life (2)   1.5 Glaucomas as cause of blindness (6)   1.6 Prevention and screening (4) 2 Anatomical structures in glaucoma (1)   2.1 Conjunctiva (0)   2.2 Cornea (6)   2.3 Sclera (0)   2.4 Anterior chamber angle (0)   2.5 Meshwork (2)     2.5.1 Trabecular meshwork (5)     2.5.2 Schlemms canal (0)     2.5.3 Scleral outlet channels (0)   2.6 Aqueous humor dynamics (0)     2.6.1 Production (0)     2.6.2 Outflow (0)       2.6.2.1 Trabecular meshwork (0)       2.6.2.2 Uveoscleral (0)     2.6.3 Compostion (0)   2.7 Episcleral veins and venous pressure (0)   2.8 Iris (0)   2.9 Ciliary body (2)   2.10 Lens (1)   2.11 Vitreous body (0)   2.12 Choroid, peripapillary choroid, peripapillary atrophy (0)   2.13 Retina and retinal nerve fibre layer (13)   2.14 Optic disc (6)   2.15 Optic nerve (2)   2.16 Chiasma and retrochiasmal central nervous system (0)   2.17 Stem cells (0)   2.20 Other (0) 3 Laboratory methods (1)   3.1 Microscopy (1)   3.2 Electron microscopy (0)   3.3 Immunohistochemistry (7)   3.4 Molecular genetics (0)     3.4.1 Linkage studies (10)     3.4.2 Gene studies (1)   3.5 Molecular biology incl. 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tube implant (10)     12.8.2 With tube implant or other drainage devices (9)     12.8.3 Non-perforating (3)     12.8.4 Using laser (0)     12.8.5 Other (0)     12.8.10 Woundhealing antifibrosis (8)     12.8.11 Complications, endophthalmitis (3)   12.9 Trabeculotomy, goniotomy (1)   12.10 Cyclodestruction (2)   12.11 Cyclodialysis (0)   12.12 Cataract extraction (1)     12.12.1 Intracapsular (0)     12.12.2 Extracapsular (0)     12.12.3 Phacoemulsification (9)   12.14 Combined cataract extraction and glaucoma surgery (0)     12.14.1 Intracapsular (0)     12.14.2 Extracapsular (0)     12.14.3 Phacoemulsification (2)   12.15 Capsulotomy (0)   12.16 Vitrectomy (0)   12.17 Anesthesia (1)   12.20 Other (1) 13 Therapeutic prognosis and outcome (0)   13.1 Prognostic factors (0)   13.2 Outcome (0)     13.2.1 IOP (0)     13.2.2 Visual field (0)       13.2.2.1 Progression (0)       13.2.2.2 Improvement (0)     13.2.3 Other (0) 14 Costing studies; pharmacoeconomics (7) 15 Miscellaneous (7)

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Abstract #13264 Published in IGR 8-1

Trabecular meshwork alteration and intraocular pressure change following pulsed near-infrared laser trabeculoplasty in cats

Stoiber J; Fernandez V; Lamar PD; Decker SJ; Dubovy S; Hitzl W; Salas N; Fantes F; Parel J-M
Ophthalmic Surgery Lasers and Imaging 2005; 36: 471-481

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BACKGROUND AND OBJECTIVE: To comparatively assess the safety and variation in intraocular pressure (IOP) of two pulsed near-infrared lasers (titanium:sapphire and alexandrite) for laser trabeculoplasty versus conventional blue-green argon laser trabeculoplasty in an animal model. MATERIALS AND METHODS: The left eyes of 15 healthy cats received a 180° laser trabeculoplasty treatment: 5 with a titanium:sapphire laser, 5 with an alexandrite laser, and 5 with an argon laser. Preoperatively and postoperatively, all animals underwent tonometry, gonioscopy, and slit-lamp examination. The cats were observed up to 12 weeks. Scanning electron microscopy and histologic examination were performed to evaluate potential alterations in the trabecular meshwork structure. RESULTS: IOP at 1 hour, 1 day, and 1 week following treatment was remarkably lower, irrespective of the laser source used. Following treatment with both near-infrared lasers, gonioscopy showed depigmentation underneath the area of the treated trabecular meshwork and histologic evaluation showed a decrease in pigment density. On scanning electron microscopy, damage to the trabecular meshwork structure could not be detected after treatment with near-infrared lasers. CONCLUSIONS: Near-infrared laser trabeculoplasty was found to be effective to temporarily lower IOP in cats. The lasers selectively altered pigment-containing cells, avoiding structural damage of the trabecular meshwork anatomy.

Dr. J.-M. Parel, Ophthalmic Biophysics Center, Bascom Palmer Eye Institute, 1638 NW 10th Avenue, Miami, FL 33136, USA

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Classification:

12.4 Laser trabeculoplasty and other laser treatment of the angle (Part of: 12 Surgical treatment)
5 Experimental glaucoma; animal models

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