A three-year-old male domestic shorthaired black cat was presented with widely dilated pupils (63a). The owner felt that he seemed to have lost his vision. She had noticed these changes in the past day and wondered whether it had any relationship to his recent treatment for urinary tract obstruction. He did not respond to a menace test and had slow and incomplete pupillary light reflexes. Ophthalmoscopic examination revealed tapetal hyperreflectivity and considerable attenuation of the retinal blood vessels (63b). Scattered rust-colored spots were also apparent within the tapetal fundus. What are the differential diagnoses for the retinal degeneration
in this cat?
