CEA is a congenital, inherited eye disease involving the retina, choroid, and sclera that sometimes affects border collies. In border collies, it is generally a mild disease and rarely significantly impairs vision. However, other eye conditions such as PRA slowly disintegrates the retina and can cause border collies to lose almost all of their vision at night which can progress into complete daytime blindness. There is now a DNA test available for CEA and, through its use, breeders can ensure that they will not produce affected pups. For example, some dogs cannot retrieve a tennis ball, as they find this activity highly stimulating, but can run for several miles with no symptoms of Border Collie Collapse.
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