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WHY DO WE BLINK OUR EYES
We  blink to cleanse and moisten the eye. Each time the eyelids close, salty secretions from the tear glands are swept over the surface of the eye, flushing away small dust particles and lubricating the exposed portion of the eyeball. Normally we blink every four to six seconds, but in irritating conditions such as a smoke-filled room, we blink more frequently to keep the eyes clean and moist.  It also cleans and moisten the cornea.


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