Screening Scheme Description

DNA test - Cone Degeneration

Details about the disease

This disease causes day blindness due to retinal cone degeneration. Cones in the retina are cells that respond mainly to bright daylight. Unlike PRA (Progressive Retinal Atrophy), cone degeneration does not affect night vision.

Clinical signs

Signs of vision problems are noticeable between 8 and 12 weeks of age. Exposure to bright light will be irritating or painful, but their vision in dim light remains normal.

How it is inherited

The disease is described as an autosomal recessive condition. This means that a dog must inherit two copies of an abnormal gene (one from its mother and one from its father) before its health is affected. A dog that inherits only one copy of the abnormal gene (from its mother or its father) will have no signs of the disease, but will be a carrier and may pass the gene on to any offspring.

Which laboratories test for this condition?

A list of laboratories and DNA tests can be found at the following link

How to responsibly breed from your DNA tested dog

If, once your dog is DNA tested, you would like to find out what their DNA test results mean, or how to select the right mate to avoid producing affected puppies, then please read our breeding advice and information on the following link

How to find out if a potential mate has been DNA tested

The Kennel Club’s “Health Test Results Finder” allows you to find the results of DNA tests carried out as part of official Kennel Club DNA testing schemes for any dog on the Kennel Club’s breed register. To access this free health tool, please follow this link


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