Ocular Parameters in Healthy Sakız and Çine Çaparı Sheep Breeds: Tear Production, Intraocular Pressure, Ultrasonographic Measurements, and Retinal Variations.

Breed-specific ocular reference values established for Sakız and Çine Çaparı sheep guide clinical ophthalmologic evaluation.

This comparative study established normal ocular parameters for two Turkish sheep breeds, Sakız and Çine Çaparı, examining 60 healthy females (30 per breed, ~2 years old). Measurements included Schirmer-I tear test (STT-I), rebound tonometry for intraocular pressure (IOP), B-mode ultrasonography, and funduscopic evaluation post-mydriasis. Sakız sheep demonstrated significantly higher tear production (18.87 vs 15.82 mm/min) and slightly elevated IOP (16.40 vs 15.75 mmHg) compared to Çine Çaparı. Ultrasonographic analysis revealed breed-specific variations in lens length and vitreous chamber depth. Fundoscopic examination identified breed-characteristic differences in tapetal coloration, nontapetal pigmentation patterns, and optic disk morphology. Bergmeister's papilla occurred more frequently in Sakız sheep. Despite observable breed differences in certain parameters, overall distributions remained similar. These findings provide essential baseline ophthalmologic reference values for both breeds, facilitating accurate clinical assessment and disease diagnosis in these sheep populations.

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