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Collie eye anomaly11/15/2022 ![]() This is the equivalent of having a pit at the back of the eye instead of a flat surface.An underdeveloped choroid looks more like a pane of glass than a blackout curtain, and because of the lack of blood vessels, the retina is starved of oxygen and cannot work properly. It also carries the blood vessels that nourish the retina. A normal choroid is dark-colored and stops light reflection within the eye. The choroid is the layer on top of which the retina rests. The anomalies that give this condition its name refer to 3 things: ![]() The physical defects in the eye are caused by improper development of the fetal eye when the pup is in the womb. ![]() If they are mated to another carrier, their offspring will have CEA. If only 1 parent has the faulty gene, the puppies are not affected, but are carriers. If the mother and father both carry the CEA gene (an autosomal recessive trait), then their puppies most likely will have the condition. Coloboma, one of the defects associated with CEA, weakens the retina’s attachment to the back of the eye, causing the retina to peel away, resulting in blindness. The exception is dogs who develop retinal detachment, which can happen suddenly at any age. Happily, this condition does not deteriorate - with 1 important exception - and so the eyesight the puppy has at 12 weeks old remains with him for life. A blind puppy will not blink when a finger is waved close to the eyeball, and bumps into objects in a room he is not used to. The signs of CEA are those associated with poor sight such as bumping into objects and locating food by smell rather than sight. Indeed, the same puppy may have different lesions in each eye. ![]() While some puppies with CEA are only mildly affected, others may be blind, even within the same litter. A newborn puppy’s eyes open around 7–10 days old. ![]()
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