Cone Degeneration
A hereditary retinal disorder causing day blindness due to loss of cone photoreceptors.
Detailed Description
Cone degeneration is an autosomal recessive disorder resulting in the progressive loss of cone cells in the retina, leading to poor vision in bright light (hemeralopia) but normal vision in dim light. It is caused by mutations in the CNGB3 gene.
Common Symptoms
- Bumping into objects in bright light
- Reluctance to go outside on sunny days
Management Options
- Environmental adaptation such as avoiding bright light
Frequently Asked Questions
Is day blindness painful?
No, but it can cause disorientation.
Can cone degeneration be prevented?
Yes, through genetic testing and selective breeding.
Will my dog go completely blind from cone degeneration?
No, night vision is typically preserved.
Condition Details
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Typical Age of Onset
6 to 12 weeks
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Testing Available
Yes
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Diagnosing Methods
Electroretinography (ERG); Genetic testing
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Preventative Measures
Genetic testing of breeding dogs
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Related Conditions
Progressive retinal atrophy (PRA), Sudden acquired retinal degeneration syndrome (SARDS)