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Your eyelids function thousands of times a day, and with each blink, your eyelashes causes eddies of air currents that (usually) move dust particles away from contact with your eye.
On occasion, dust particles (Or L.A. Smog) will contact your eyeball's surface, causing extreme discomfort and blurring of vision.
The blurring is caused by the tear ducts. They are triggered when an irritant contacts the eyeball and flush out the irritant with tears.
Without operational tear ducts, we'd all be perpetually blinded by ordinary wind-blown dust.
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