Collie Eye Anomaly1

Posted: Tue April 10th, 2012 @ 2:34 pm by Laura Collins
Views: 2179
Collie eye anomaly (CEA) is an inherited incurable disorder of Collies.  It may be detected with the aid of a special instrument only available at a canine ophthalmologist between 5 and 9 weeks of age.  It affects both eyes, and one eye may be worse than the other.  Generally, the disorder does not worsen as the dog ages unless the retina detaches.  Retinal detachment usually results in blindness of that eye.
 
Optigen can now determine the genotype of the breeding adult as affected, normal eyed carrier, and normal eyed noncarrier.  This knowledge allows breeders further control and responsibility in the selection of breeding stock to avoid producing puppies with Collie Eye Anomaly after the parents have been Optigen tested.
 
Affected dogs have less than normal vision and unless very severe, it is difficult to tell by their actions.  In other words, most Collies with Collie eye retain adequate functional vision thus allowing the disorder to go unnoticed.
 
Only selective breeding of normal animals will significantly reduce the incidence of Collie eye. 
 
Some Descriptive Terms
 
Choroidal hypoplasia:   Pale areas in the rear of the inner eye.  These represent defective formation of the retina and the middle, vascular layer of the eyeball and cause blind visual spots in the vision field.
 
Colobomas: These are pits or cave-like defects in the inner surface of the back of the eyeball due to the defective formation during fetal development.
 
Retinal Detachment: The pulling away of the retina from the underlying tissue layers on which it rest.