Retinal dysplasia may occur from many causes. Severe damage or necrosis of the developing retina from infectious diseases including BVD, Feline Panleukopenia, Feline Leukemia, Canine Herpes virus, and Blue Tonque. Glia scars, especially in those secondary to retinal necrosis e. Loss of retinal cells 5. PRA inherited as an autosomal recessive tract is always bilateral and progressive. Collie b. Photoreceptor degeneration in Miniature Poodle, American Cocker Spaniel, and English Cocker Spaniel.
Affected animals can see moving and distant objects and have trouble seeing fixed and close objects.
Since there is excessive membrane peroxidation of photoreceptor outer segments leading to accumulation of lipopigments, the defect appears to be pigment epithelial dystrophy. Progressive retinal atrophy in cats PRA in cats appears to be a rod-cone dysplasia in Domestic Short Hair. In Abyssinian, PRA is reported to be an autosomal recessive trait. This appears to be a specific disease of cats associated with Taurine deficiency. The lesion is bilateral and is centered on area centralis.