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The transparent covering over the eye of snakes is called the brille (also known as the spectacle or ocular scale). It is a fused, transparent eyelid that protects the eye and is shed along with the rest of the skin during ecdysis (shedding). Snakes lack movable eyelids. The nictitating membrane is a third eyelid present in some vertebrates; the cornea is the transparent front part of the eye, but it is covered by the brille in snakes.