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Refractive state following retinal reattachment and silicone oil tamponade in dogs

Objective: To evaluate the refractive error induced by intraocular administration of silicone oil (SiO) in dogs. Animals: 47 client-owned dogs evaluated for blindness secondary to retinal detachment. Procedures: 3-port pars plana vitrectomy with perfluoro-octane and SiO exchange (1,000- or 5,000-cen...

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Bibliographic Details
Published in:	American journal of veterinary research Vol. 73; no. 8; pp. 1299 - 1304
Main Authors:	Hoffman, Allison, Wolfer, Joe, Occelli, Laurence, Lehenbauer, Terry W, Sapienza, John, Novak, Jenny M, Combs, Kelli L, Konrade, Kricket A
Format:	Journal Article
Language:	English
Published:	United States 01-08-2012
Subjects:	Animals Aphakia, Postcataract - physiopathology Aphakia, Postcataract - therapy Aphakia, Postcataract - veterinary blindness Dog Diseases - chemically induced Dog Diseases - surgery Dog Diseases - therapy Dogs Dose-Response Relationship, Drug Endotamponade - adverse effects eyes Female Fluorocarbons - therapeutic use Hyperopia - chemically induced Hyperopia - veterinary Injections, Intraocular - veterinary Male oils Postoperative Period Pseudophakia - physiopathology Pseudophakia - therapy Pseudophakia - veterinary Retinal Detachment - complications Retinal Detachment - surgery Retinal Detachment - therapy Retinal Detachment - veterinary silicone Silicone Oils - administration & dosage Silicone Oils - adverse effects Silicone Oils - therapeutic use surgery Time Factors Vitrectomy - veterinary
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Summary:	Objective: To evaluate the refractive error induced by intraocular administration of silicone oil (SiO) in dogs. Animals: 47 client-owned dogs evaluated for blindness secondary to retinal detachment. Procedures: 3-port pars plana vitrectomy with perfluoro-octane and SiO exchange (1,000- or 5,000-centistoke SiO) was performed in 1 or both eyes for all dogs (n = 63 eyes), depending on which eye or eyes were affected. Dogs were normotensive, had complete oil filling of the eyes, and were examined in a standing position for retinoscopic examination of both eyes (including healthy eyes). Results: The mean refractive error for SiO-filled phakic and pseudophakic eyes was 2.67 and 3.24 D, respectively. The mean refractive error for SiO-filled aphakic eyes was 6.50 D. Dogs in which 5,000-centistoke SiO was used had consistently greater positive refractive errors (mean, 3.45 D), compared with dogs in which 1,000-centistoke SiO was used (mean, 2.10 D); however, the difference was nonsignificant. There was no significant linear relationship between refractive error and the number of days between surgery and retinoscopy. Conclusions and Clinical Relevance: Hyperopia was observed in all dogs that underwent SiO tamponade, regardless of lens status (phakic, pseudophakic, or aphakic). Aphakic eyes underwent a myopic shift when filled with SiO. Pseudophakic eyes appeared to be more hyperopic than phakic eyes when filled with SiO; however, additional investigation is needed to confirm the study findings.
Bibliography:	http://dx.doi.org/10.2460/ajvr.73.8.1299 ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	0002-9645 1943-5681
DOI:	10.2460/ajvr.73.8.1299