(The eye anomaly «merle» can be confused
with choroidal hypoplasia, primarily in dogs from merle to merle breeding and whose coat color is whiter than their littermates.
The result is the percentage of collies affected
with choroidal hypoplasia remains high, but the severe grades of the disease (colobomas and retinal detachments) have decreased due to this conscientious breeding.
Not exact matches
Border Collie breeders are usually very proactive in testing for the genetic diseases Collie Eye Anomaly /
Choroidal Hypoplasia, Neuronal Ceroid Lipofuscinosis and Trapped Neutrophil Syndrome, but you should check
with your breeder before buying a Border Collie on the status of their dogs for genetic diseases.
All Aussies affected
with CEA will exhibit
choroidal hypoplasia in both eyes.
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.
The disease is reminiscent of the
choroidal hypoplasia phenotype observed in humans in conjunction
with craniofacial or renal abnormalities.