Snakes don't blink because they do not have eyelids. Each eye is covered with a single clear eye scale. These eye scales protect eyes from injury and prevent the eyes from drying out.
That is the reason snakes are unable to blink their eyes and sleep with open eyes. Most of snakes have very bad eye sight due to shed its eye scale and can only track the presence of animals by their heat and when they move.
A snake’s eye scales are part of its skin. This means when a snake sheds its skin, it must also shed its eye scales. Prior to shedding, a snake’s skin becomes dull and the eye scales become cloudy or opaque. This is because snakes secrete a milky fluid between the old skin and the new skin before they shed.
When they’re ready to shed, snakes rub their snouts against something until their skin splits. They then work to peel the skin back from their lips to their tails, turning it inside out like a stocking as they do so. Snakes tend to shed their entire skin in one piece and the eye scales are very obvious on a shed skin.
Eyelids are not the only feature snakes lack. Snakes use their tongues to "smell," as they do not have nose also. The tongue constantly flicks in and out of its mouth, collecting particles from the air and identify that what is moving around by bringing them into contact with specialized organs in the mouth that examine them and tell the snake what they belong to. Even Snakes also not having ears, So they using an incredible sensitivity to vibrations in the ground to determine what is moving on around them and how far it is.
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