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Catagory E simply means there was a lens anomaly. Many juvenile opacities probably do not have any visual significance. CERF is mostly concerned with genetically inherited ocular disorders, such as PRA and Retinal Dysplasia. Certain cataracts are genetically linked. Many lens opacities in dogs and humans are linked to developmental "injuries" during gestation. Maternal stress during gestation can interfere with proper lens development and opacities can occur. This could be the result of a maternal infecton or other stressor. In any case, these opacites would not be passed on to future generations.

Any ocular trauma significant enough to cause a cataract in a dog, would likely result in marked visual impairment. It would be unlikely a dog would be able to further compete in field trials.
 
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