3.2 Common health problems. Collie eye anomaly (CEA) and epilepsy are considered the primary genetic diseases of concern in the breed at this time. 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. There are different types of hip testing available including OFA (Orthopedic Foundation for Animals) and PennHip. Radiographs are taken and sent to these organizations to determine a dog's hip and elbow quality.