Why Do People Blink?

Imagine your eyes are like windows. If you kept them open all day, they'd get dusty and tired. Blinking is like wiping the dust off your window so you can see clearly again. When you blink, your eyelids close quickly, spreading tears across your eye to keep it clean and moist.

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Examples

When you're reading a book for a long time, your eyes might start to feel dry, that's when you blink more often.
Your eyes blink every time you see something bright, like the sun or a flash of light from a camera.
Even while sleeping, your eyes still blink, they just do it very slowly.

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Categories: Biology · eyes,reflexes,neurology,human biology