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The nictitating membrane of a masked lapwing as it closes over the left eye, originating from the medial canthus. The nictitating membrane (from Latin nictare, to blink) is a transparent or translucent third eyelid present in some animals that can be drawn across the eye from the medial canthus to protect and moisten it while maintaining vision.
Common misnomers include adenitis, hyperplasia, adenoma of the gland of the third eyelid; however, cherry eye is not caused by hyperplasia, neoplasia, or primary inflammation. [3] In many species, the third eyelid plays an essential role in vision by supplying oxygen and nutrients to the eye via tear production. [4]
Cats have a third eyelid, the nictitating membrane, which is a thin cover that quickly closes from the side when the cat blinks and is hidden when the cat's eyelid opens. [8] This third eyelid extends upward to protect the eye from trauma, like when moving through tall grass or capturing a prey. [8]
Lentigo in cats is a common dermatological condition characterized by the presence of small, flat, brownish spots on the skin — particularly around the lips, nose, and eyelid margins. Unlike in ...
Image credits: dbenc Audio isn’t the first cat to go viral for having four ears. Midas made headlines in 2021 when he was adopted by a woman in Turkey. The Russian Blue mix also sports quadruple ...
Cats have three eyelids. The cat's third eyelid is known as the nictitating membrane. It is located in the inner corner of the eye, which is also covered by conjunctiva. In healthy cats, the conjunctiva of the eyelids is not readily visible and has a pale, pink color.
Dora and Felix were born without eyelids, and without corrective surgery, the kittens were likely to go blind within a year. Surgery helps cats born without eyelids see bright future Skip to main ...
Exuvia of grass snake Natrix natrix, showing brille scales The brille (also called the ocular scale , eye cap or spectacle ) is the layer of transparent, immovable disc-shaped skin or scale covering the eyes of some animals for protection, especially in animals without eyelids.