Although not common, this eye issue is found in the breed around the world. Thankfully there is a DNA test that is available for Pyrenean Shepherds to identify dogs, in addition to it being diagnosable why canine ophthalmologists.
Progressive retinal atrophy (PRA): an umbrella term used to describe a group of inherited dysplastic, dystrophic, or degenerative disease of the retinal visual cells (photoreceptors, retinal pigment epithelium, or both). (From OFA Eye Disease Glossary)
Progressive rod-cone degeneration (PRCD): Typically refers to recessively inherited generalized loss of rod photoreceptors followed by cone degeneration. Many different genetic mutations result in a similar phenotypic presentation. (From OFA Eye Disease Glossary)
PRA – UC Davis (Listed for Pyrenean Shepherds)
Research & Articles
Inherited retinal diseases in dogs: advances in gene/mutation discovery (Keiko Miyadera) – Inherited retinal diseases (RDs) are vision-threatening conditions affecting humans as well as many domestic animals. … Dogs affected with PRA initially present night blindness, eventually progressing into total vision loss.