My cat's pupils are different sizes sometimes. Is this normal?

Question

My cat's left pupil is sometimes bigger than the right. Other times it is the same size. What's happening? Pet's info: Cat | American Shorthair | Female | spayed | 5 years and 7 months old

Jennifer Summerfield, DVM CPDT-KA · Accepted Answer

This is a condition called anisocoria - it can be caused by an injury or a serious infection in the eye, or by a neurologic problem causing a problem with the nerves that control the pupils. This is always a concerning problem, so I would recommend having Emmy examined by a vet as soon as you are able to. He/she can do a complete neurologic exam and also do some eye testing if needed to help determine what is causing the problem and what can be done to treat it.

My cat's pupils are different sizes sometimes. Is this normal?

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