Collie Eye Anomaly (CEA)-- a complex of congenital defects including
choroidal hypoplasia, also called chorioretinal dysplasia — a
thinning of the vascular tissue within the eye), optic disc coloboma / staphloma — incomplete development of the optic nerve where it enters the eye, and retinal dysplasia or detachment — sections of retina, the vision reception tissue, that are not properly attached to the wall of the eye.
All dogs with CEA have bilateral
choroidal hypoplasia (CH), also called chorioretinal dysplasia, a
thinning of the vascular tissue in the back of the eye which does not significantly impair vision.