Progressive Retinal Atrophy

Progressive Retinal Atrophy (PRA) is a group of eye disorders which cause progressive degeneration of the retina through thinning and decreased blood flow. Depending on the variant the rod (dim light) or cone (bright light) photoreceptor cells of the eye may also be affected and age of onset and speed of progression can vary. Affected dogs typically have initial vision loss in low light, then peripheral vision loss, and eventually total blindness.