DRY EYES OCCUR WHEN THE TEAR DUCTS DO NOT PRODUCE ENOUGH FLUID (tears) to keep the eyes moist,resulting in burning and irritation.This  is more common in women than in men,and women's  increases after menopause.Contact lens wearers,lack of vitamin A ,age over sixty-five,antihistamines,decongestants act.
serious damage by sun or welding ,toxic dust and lack of moister in the air.

scargone-will keep eyes moist for long periods of time wile lubricating its repairing  the damage