In October 2008, when he was almost 2 years old, Trevor was given a routine Optigen screening for PRA. PRA (progressive retinal atrophy) is a genetically transmitted disease that leads to blindness. Even though PRA is extremely rare in Golden Retrievers, Trevor was found to be "affected" with prcd-PRA.
From the Optigen website:
PRA refers to a group of diseases that cause the retina of the eye to degenerate slowly over time. The result is declining vision and eventual blindness. “prcd” stands for “progressive rod-cone degeneration” which is the type of PRA known in several breeds.
Sept. 2015: To date neither Trevor nor any of the other 5 prcd-PRA-affected Goldens I personally know have shown any symptoms, nor has any evidence of retinal degeneration been detectable in their annual eye exams.
Trevor's Supplement Regime.