The pupil may also constrict inappropriately due to inflammation in the eye or painful conditions like corneal ulcers. Pupils can abnormally dilate due to conditions like glaucoma or damage to the retina in the back of the eye. Here are some of the causes of anisocoria in cats:ĭiseases inside and outside the eye can lead to anisocoria in cats. It is difficult to provide an exhaustive list of all the causes of mismatched pupil sizes in cats because there are so many. Therefore, if you notice your cat’s pupils are different sizes, even occasionally, a veterinary exam is important to uncover the cause. While dogs and people can develop “idiopathic” anisocoria, in which the pupils are occasionally different sizes for no reason at all, this is much rarer in cats. Can Anisocoria in Cats Be Fatal?Īlthough anisocoria itself is not fatal, nor even painful in most cases, the underlying cause is the more important issue. The abnormal eye may have either the smaller or bigger pupil, depending on the cause. When a cat’s pupils do not dilate or constrict appropriately, it can indicate a problem in one or both eyes. A cat’s pupils do this by getting wider or narrower in response to changes in the brightness of their environment. The function of pupils is to control the amount of light entering the eye. What Is Anisocoria in Cats?Īnisocoria in cats is defined as a significant difference in the pupil size of each eye. Fluorescence in situ hybridization (FISH): This uses fluorescent dye to mark the chromosomes so doctors can see them.Go to the emergency vet if you notice that one of your cat’s pupils is wider than the other.Karyotype: This gives your doctor a picture of the chromosomes arranged from smallest to largest. The two types of genetic tests the specialist might do are: The sample would be sent to a specialist, who would look for signs of the problem chromosome. Your doctor would take a small sample of the placenta through your abdomen with a needle or through your vagina with a small, thin tube called a catheter. Or they might recommend chorionic villus sampling (CVS). If they think your baby might have it, they can follow up with amniocentesis - they'll take fluid from your womb with a long needle. If you're pregnant, your doctor may see signs that your child has cat eye syndrome on an ultrasound, which uses high-frequency sound waves to make detailed images of your baby. They'll take some blood or do a bone biopsy (take out some bone marrow with a needle). To be sure your child has cat eye syndrome, the doctor can test a sample of tissue. It's rarely passed down from the parents, but it's possible for it to happen that way. Doctors aren't sure why it doesn't form correctly. CausesĬat eye syndrome happens when there's a problem with the 22nd chromosome. The child also might have mild developmental or learning delays, behavior issues, or problems with speech.
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