EVERYDAY SCIENCE

Detailed explanation-1: -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. The brille has evolved from a fusion of the upper and lower eyelids.

Detailed explanation-2: -Snakes have eye scales rather than eyelids. Eye scales, which are typically known as spectacles or brilles, are essentially a snake’s specialised version of an eyelid. Snakes don’t have legs so their eyes are constantly in close contact with the ground, swept with leaves, grit and dust.

Detailed explanation-3: -Reptiles have a tough, dry, scaly skin that protects them from predators and allows them to live in dry places by reducing water loss. Reptilian scales are made of keratin, like hair, and found in an overlapping arrangement. This creates a sort of environmental shield for the animal.

Detailed explanation-4: -Geckos also have a third eyelid which acts as extra protection and sweeps across the surface of the eye to clean it when they blink. However, in many types of gecko the eyelids have joined together to form one clear see-through eyelid which is called the spectacle.