Progressive Retinal Atrophy, or PRA, is a condition of the retina in the eye and encompasses many diseases which all progress over time and eventually lead to blindness. The retina works in the eye much as the film in a camera works. It changes the light it receives into images which are then sent down the optic nerve to be interpreted by the brain. When a dog has PRA the retina either stops developing prematurely or the light receptors degenerate early in life. With this condition both eyes are equally affected. The different forms of PRA vary in the age at which they first develop and in the rate at which they progress. Cases can be early onset with rapid progression to late onset with slow progression or any combination of the sorts. Every case is different and definite age of onset or how quickly progression will occur can never be known for sure.
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