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.

• 渐进性视网膜萎缩（PRA）是一种发生于某些犬种的双侧性视网膜遗传病。该疾病导致渐进性视力下降直至失明。