Q: My cat is 9 and one of his pupils has started to look milky. He does have dilation in both pupils. His behavior is the same. I am just worried he may be going blind.
A: As cats get older, the lenses in both eyes acquire a slightly cloudy appearance. This natural aging change is called lenticular sclerosis and it is often mistaken for cataracts. It doesn’t affect vision and is nothing to worry about.
I’m concerned about your cat, however, since only one eye is affected. With lenticular sclerosis, both eyes are affected. Cats’ pupils can vary in size, from a tiny little slit to big round open circles, depending on the ambient light. However, pupils that stay dilated all the time may be a sign of a vision problem. You need to take your cat to your veterinarian. Depending on the findings, he or she may refer you to a veterinary ophthalmologist for further evaluation.