Abnormalities such as CH and colobomas can then be observed.Īt the age of 3 months, the retina becomes its final 'adult' colour, and this can hide the issues in the choroid (this is commonly observed in dogs said to 'go normal'). In around 5-10% of dogs with CEA, retinal detachment or haemorrhage of blood vessels can even occur, which can cause blindness. (source: OptiGen)Ī veterinary ophthalmologist usually diagnoses CEA clinically by observing the back of the eye in puppies under 8 weeks.
Some dogs affected with CEA may have colobomas around the optic nerve, caused by 'pits' in the tissue. These can cause degeneration in eyesight or even blindness. It is not a degenerative condition, though complications can occur, usually in the first few years of life. This is often quoted as 'severe' CEA, 'mild' CEA, or 'clear' - however do not mix up clinically clear for genetically clear - clinically 'clear' dogs are still affected by CEA, but to a lesser extent at time of testing. Examples range in severity, with puppies who are affected often being tested clinically before 8 weeks and graded. As such, all dogs with CEA have a degree of choroidal hypoplasia (CH) - which causes the choroid to appear pale due to thinning when viewed, leaving the sclera and vessels underneath visable.ĭogs with CEA will experience eyesight issues for the entirety of their life.
Collie Eye Anomaly (CEA) is an autosomal recessive inherited eye disease that affects many of the collie breeds, and is extremely prevalent in Rough and Smooth Collies, between 70 to 97% carry at least one mutation. (source: Animal Genetics UK) and the rate of affected dogs can be as high as 85-90%+. (source: OptiGen) CEA causes underdevelopment, or hypoplasia, in the eye under the retina (choroid).
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