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Cats have a third eyelid called a nictitating membrane

Cats have a third eyelid called a nictitating membrane

Cats have a third eyelid called a nictitating membrane

A translucent third eyelid — the nictitating membrane — sweeps across the eye for protection and moisture during blinks and scrapes.

It becomes more visible when a cat is sleepy, unwell, or dehydrated. Owners often notice it as a pale curtain at the inner corner.

Two eyelids for blinks; a third for armor. The hidden wiper keeps the hunting lens clean in rough country.

Shahzad Mahota Shahzad Mahota @shahzad-mahota

Cats have a third eyelid called a nictitating membrane