However, there are medical reasons that cause cats’ pupils to dilate, including: Stress. Healthy eye dilation in cats happens when their pupils naturally grow larger in dim light or darkness and become narrower in bright environments. If you notice any type of injury or abnormality with your cat's eyes, take him or her to the vet immediately to get it checked out.Ĭats run hotter than humans, but that doesn't mean that they can't get fevers. How dilated cat eyes can signal health problems. One of the ways cats announce that they don't feel well is when their third eyelids are up - that is, they've moved partially across the eyeball. Again, it's something you rarely notice unless there's a problem. The third eyelid, or nictitating membrane, appears when your cat blinks or closes his eyes this wonderful adaptation moves from the inside corner of the eye to cover the front surface of the eyeball. You usually don't notice the conjunctiva unless it swells up, in which case it may protrude from under the eyelid, giving the eye a "meaty" appearance. Yellow or "bloodshot" sclera, ulcers or splotches of color, and signs of damage (like scrapes or bruises) are indicators of trouble.Ĭonjunctiva is the pink, fleshy stuff under the eyelids that helps hold the eye in place. Obviously, this should be white (perhaps with some small blood vessels visible). The "white" of the eye is officially known as the sclera. Old cats' irises may degenerate and take on dark, freckle-like spots, but this isn’t always a sign of trouble. It's not unusual for the iris to change with age.
If you notice changes in your cat's iris or the appearance of splotches of other colors, contact your vet. Occasionally, a cat will be "odd-eyed" each eye is a different color. Cats usually have some variety of green, yellow or blue eyes.
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