Why do people blink?

Blink is actually a physiological need, blink can let tears evenly wet cornea, conjunctiva, so that the eye is not dry, keep cornea luster, remove dust and bacteria from conjunctiva sac. If you do not blink, the tear film on the eye will evaporate quickly, we will feel dry eyes uncomfortable, tingling, tears, do not believe you try not to close your eyes for a minute, can not stand it. Therefore, blinking is actually a protective effect, when the wind and sand into the eyes due to the stimulation of foreign bodies will produce reflex blinking, after blinking attempts to wash away foreign bodies into the eyes with tears, can not blink or blink too frequently this is abnormal. Some people due to facial nerve paralysis and can not blink, so dry eyes, pain is very uncomfortable. Some children develop habitual frequent blinking due to imitating other people's blinking movements. This habit is often difficult to get rid of at once. It looks very uncomfortable. It is a very bad habit and should be corrected.