[Refraction of the dog eye]

The refraction of 50 eyes of nonsedated dogs was measured by retinoscopy. The slightly hyperopic to middle-grade myopic refraction found in earlier studies was seen in individual cases; however the mean value of 0.5 D is close to emmetropy. The differences in the results of measurements made under non-influenced accommodation and cycloplegia were not significant. Keratometry with the Javal ophthalmometer showed a mean cornea radius of 8.77 mm. A average axial length of 20.9 mm was determined by sonography. In some instances the parameters examined varied considerably.