What is Collie Eye Anomaly?
Collie Eye Anomaly, also known as CEA, is an inherited disease causing defects in the formation of the eye. CEA has now been determined to be a genetic disorder in the Nova Scotia Duck Tolling Retriever. Several forms of the disease are recognized, but the most common is a lesion on the back of the eye called choroidal hypoplasia (CH). All dogs affected by CEA have choroidal hypoplasia, by definition. CEA is not a progressive disease like prcd-PRA and most affected dogs may only have mildly impaired vision. More severely affected dogs may have pits (colobomas) affecting the retina and nearby tissues and in the most severely affected eyes, retinal hemorrhaging and detachments can occur, resulting in blindness. Varying degrees of CEA and definitions are listed below: • Choroidal Hypoplasia, Chorioretinal Change, Choroidal Dysplasia: These refer to abnormalities in the coloring or pigmentation of the choroid or central layer of the eye’s lining. This is the most common abnormality found i
