Progressive retinal atrophy, cone-rod dystrophy 1 is an inherited eye disease affecting dogs. Affected dogs typically have abnormal thinning and degeneration of the retina by 11 weeks of age. Evidence of retinal thinning can be identified on a veterinary eye exam by 3 to 6 months of age. Vision is severely impaired by one year of age and by 20 months of age affected dogs have an advanced stage of retinal degeneration.

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