Eye anomaly, also more commonly known as Collie Eye Anomaly or CEA, is found in all breeds of collies including the Smooth and Rough Collies, Shetland Sheepdogs, and Australian Shepherds. The condition also occurs to a lesser extent in the Nova Scotia Duck Tolling Retriever and some types of heelers.
CEA is a recessive genetic condition, which means that both parents have to be carrying the recessive gene for the condition to be passed down to their puppies. While this may sound like terrific news to eliminate the condition, the current estimate is that up to 85% of all collies in the United States are affected by this condition and that the numbers are almost as high in other countries and areas around the world. [...]