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The Cat picture is courtesy of Darshminder .Cats inner eyelid - palpebra tertia.
Third eyelid exist in cats, birds, sharks and other animals… In some animals it is transparent.
Most of the mammals have third eyelid, so the question is not why do cats have a third eyelid but why people don't have it.
When cat's third eyelid moves on the cornea it:
1. adds a layer of tears,
2.it redistributing layer of tears
3. it removes debris from the surface of the cornea.
Third eyelid exist in cats, birds, sharks and other animals… In some animals it is transparent.
Most of the mammals have third eyelid, so the question is not why do cats have a third eyelid but why people don't have it.
When cat's third eyelid moves on the cornea it:
1. adds a layer of tears,
2.it redistributing layer of tears
3. it removes debris from the surface of the cornea.
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