WHY do people blink?

Studies tell us that the average person blinks once every 2 to 10 seconds. We do this automatically as our eyelids protect our eyes from damage. Sometimes we blink intentionally, using what is called “sign language”. As an example, we may blink to get attention, inviting another person to flirt. Sometimes we blink to express surprise, as if to say, “I can’t believe my eyes!”

In humans, the inner surface of the upper and lower eyelids, as well as the eyes themselves, are lined with a thin, almost transparent membrane, the conjunctiva. The conjunctiva serves to moisten the surface of the eyes, because they need moisture to move properly. During blinking, the eyelid spreads moisture through the conjunctiva and also directs it to the corners of the eye.

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