The tears your eyes normally produce are necessary for overall eye health and clear vision. Dry eye occurs when your eyes do not produce enough tears or produce tears which do not have the proper chemical composition. Dry eye symptoms can result from the normal aging process, exposure to environmental conditions, problems with normal blinking, or from medications such as antihistamines, oral contraceptives or antidepressants. Dry eye can also be symptomatic of general health problems or other diseases. If dry eye is untreated, it can harm your eye.