Nictitating membrane

Used for

In humans, the nictitating membrane is the apparently useless pink lump in the inner corner of the eyes; it is permanently folded into that corner and no longer functions, apparently rendered redundant by evolution some time in the past.
The nictitating membrane is part of the conjunctiva, a mucus membrane.
The nictitating membrane is stored in the lower corner of the eye nearest the nose and it sweeps outward to clean and wet the eye, while still allowing light to penetrate.
The purpose of the nictitating membrane is to add protection to the eye from debris and irritation as well as serve as a barrier while swimming to land animals.
The nictitating membrane is transparent except for the leading edge, which is pigmented and contains some cartilage.

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