Colley eye abnormality (AOC)


our four legged friend’s eyes are particularly fragile. Some eye diseases can lead to complete blindness, such as Collie’s eye deformity. However, according to the form of this situation, this is not always the case.

Colley eye abnormality or AOC is a genetic eye disease. It can develop in different forms, from the lightest (which has no significant impact on the dog’s visual ability) to the most serious (which may lead to complete blindness of animals). Let’s look at this disease in more detail…

is a genetic disease

Colley eye anomaly (AOC) is a genetic binocular disease, which means that it usually affects both eyes when announcing itself.

This is due to the abnormal development of a component in the eye called the choroid, a highly vascularized tissue located under the retina. Choroidal damage is usually localized. What races are involved in

? There are several breeds of dogs in

that are related to Corey’s abnormal eyes. As the name suggests, the disease mainly affects colleges. Therefore, among the susceptible breeds, there are long haired shepherds, short haired shepherds and their close relatives Shetland shepherds.

however, there are cases in other breeds, such as Australian shepherds, Lancashire shepherds and Nova Scotia hounds.

Symptoms and manifestations of

ocular abnormalities without ophthalmic diagnostic tools, it is difficult to recognize the occurrence of this ocular disease, namely

ocular abnormalities. This makes the detection more complex because the clinical symptoms associated with it vary greatly, depending on the affected species and individuals.

therefore, the disease is often late in dog owners, That is, when the animal’s vision drops sharply or even disappears. At this point, the dog’s positioning in the environment seems not very good. For example, when he is touched, he may have some unusual reactions. Because he can’t see clearly, he notices you approaching him very late. This late detection proves that it is necessary to understand the risk of this disease in some breeds. The ocular abnormalities of


dogs may be mild (grade 1 and 2), which are neither evolutionary nor disabling. That is, the affected animals maintain normal visual ability.

this disease may also occur in the form of severe (grade 3 and 4). In this case, it is severe and ongoing, which may lead to retinal detachment and intraocular hemorrhage. In the most serious cases, this condition can lead to blindness in dogs.

it is worth noting that due to its association with single gene (nhej1) mutations in border shepherds and Australian shepherds, Collie’s eye abnormalities, whether mild or severe, It can be passed on to dog offspring in a heavy form. The transmission of the disease is somewhat different in long haired shepherds: it is a polygenic abnormality, a change caused by multiple genes.

the disease is transmitted through an autosomal recessive pattern. In other words, every parent must carry at least this disease. When and how is


as mentioned above, the diagnosis of dog Collie’s eye deformity can only be carried out in veterinarians, and it is more specificUsually an ophthalmologist, he uses glasses. The tool includes a light source for illuminating the continuous medium constituting the eye, through which light can be observed, and a magnifying glass for detailed observation of these media. Through this tool, veterinarians mainly look for a pale spot and irregularly distributed blood vessels of different sizes.


can also find a colostrum tumor in some eye abnormalities in dogs. This is a hole in the disc.


coli’s eye abnormalities can be diagnosed from 5 weeks to about 10 weeks. After this time, especially from the 12th week, the diagnosis becomes more complex.

on the other hand, there is a genetic test that can detect the abnormalities of Colley’s eyes. This test is particularly useful for breeders of risky varieties: it detects homozygous individuals (both copies of nhej1 gene are mutated, resulting in disease) and heterozygous individuals (one of the two copies of nhej1 gene is mutated). It is strongly recommended that this test be conducted before raising collies or breeding related dogs, or at least testing at risk puppies before sale.


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