A condition in which one’s eyes do not produce enough tears or produce tears which do not have the proper chemical composition. Often, dry eye is part of the natural aging process. It can also be caused by blinking or eyelid problems, medications like antihistamines, oral contraceptives and antidepressants, a dry climate, wind and dust, general health problems like arthritis or Sjogren's syndrome, and chemical or thermal burns to your eyes. Symptoms may include irritated, scratchy, dry, uncomfortable, or red eyes; a burning sensation or feeling of something foreign in your eyes; and blurred vision. Excessive dry eyes may damage eye tissue, scar your cornea (the front covering of your eyes) and impair vision, and make wearing contact lenses difficult. (Ref: AOA)