Definitions for "Progressive retinal atrophy"
A congenital defect that causes peripheral vision loss first, progressing to night blindness, and then to total blindness in Papillons. Never breed a dog that is afflicted with this defect.
A progressive degeneration of the retina that is inherited.
A recessively inherited eye disease in which the retina degrades until the dog becomes blind. Very rare in Australian Shepherds. Traumatic retinal damage may be misdiagnosed as PRA.