Progressive retinal atrophy (PRA) is a group of inherited eye disorders that occur in many different dog breeds. Each form of PRA shows a simple pattern of mendelian inheritance, and is due to a mutation in one gene. However, over 20 different PRA-causing mutations have now been identified in a number of different genes. Some breeds, including Golden Retrievers (GR), may have more than one genetic form of PRA.
Canine PRA is considered to be the equivalent of Retinitis Pigmentosa (RP), which is a group of inherited human eye diseases.