A disease which results in thinning, shrinking retinal cells and central or total blindness. This happens gradually. About PRA, here's where I totally agree with Val regarding getting them to an eye specialist for a baseline which my regular vet did not recomment, but we did it anyway. The eye doctor saw this before Max developed cataracts. Max is not a candidate for cataract surgery as a result of this condition.(from Anne & Max) See also cataracts and dry eye for additional information about eyes.
Progressive retinal atrophy (PRA) is a genetic disease of the retina that occurs bilaterally and is seen in certain breeds of dogs. It causes progressive vision loss culminating in blindness. PRA is actually a group of retinal degenerations with different causes.