Dry eye

Source: all about vision
Dry eye syndrome is a chronic lack of sufficient lubrication and moisture on the surface of the eye.
Its consequences range from subtle but constant irritation to ocular inflammation of the anterior (front) tissues of the eye.
Dry eyes also are described by the medical term, keratitis sicca, which generally means decreased quality or quantity of tears. Keratoconjunctivitis sicca refers to eye dryness affecting the cornea and conjunctiva


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http://www.allaboutvision.com/conditions/dryeye.htm