Prevalence, differences, and potential correlation to age, sex, breed, coat color, iris color, and geographic location in naturally occurring refractive errors in the normal equine eye from Germany and North Carolina
Veterinary Ophthalmology.
author keywords: ametropia; astigmatism; emmetropia; equine ophthalmology; refraction; streak retinoscopy
TL;DR:
Most eyes evaluated are emmetropic, or shifted myopically, with excellent agreement between eyes of the same horse, and sex, iris color, and geographic location appear to impact refraction in horses.
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