Why is there a dark, spreading spot on my aging cat's iris?

Question

My 10 year old cat developed a dark spot on her golden iris several years ago. It has slowly spread until about 1/2 her pigmentation appears black, but only in the one eye. She has no symptoms of irritation, swelling, bulging, loss of sight, discharge, etc. I asked a vet and he said not to worry about it. I'd still like to know what is causing it. Pet's info: Cat | Mixed Breed | Female | spayed | 10 years and 4 months old | 15 lbs

Dr. Rachel · Accepted Answer

There are a couple of possibilities here for the changes to Creo's iris. One is iris atrophy, which is a normal aging change. This can often result in pigment change and a "moth-eaten" appearance to the iris or an irregular iris border. Another would be a uveal cyst, which is a darkly pigmented circular lesion that can be attached to the iris. Both of these are generally benign. If you notice any changes in Creo's vision, changes to the eye, or signs of pain (squinting, redness, swelling, etc.), have him re-evaluated by your vet just to be safe.

Why is there a dark, spreading spot on my aging cat's iris?

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