The development of cataracts in the eyes of a cat is very rare. Unlike other animals, cats do not normally develop cataracts due to the effects of age. In most cases, a cat that develops cataracts has another underlying health condition that caused the cataract to develop as a symptom. If you suspect that your cat has a cataract, there are a number of diagnostic tests that your veterinarian will perform to confirm that a cataract is present and to find out why the cataract appeared.