What causes the darker colors to occur around part of the outer iris of my cat's eye? They look like lines and follow the curve of his iris. He is 10 years old, in good health, other than a few pounds overweight. :confused:
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What causes the darker colors to occur around part of the outer iris of my cat's eye? They look like lines and follow the curve of his iris. He is 10 years old, in good health, other than a few pounds overweight. :confused: