Dry eye has many causes. Some causes are from various external influences such as one’s environment. Other causes are related to changes in the body’s nervous, hormonal, and immune systems that can occur over time. When a person has chronic dry eye, inflammatory changes in the tear-producing glands and in the eye’s surface can interfere with the production of normal tears. When this occurs, the eye produces fewer tears that are less effective. This results in a tear film that evaporates more quickly than normal which provides less moisture and protection for the eyes surface. With the tear films protection diminished, the eyes may experience painful symptoms of dry eye and damage to the eye's surface may occur.
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