Tears are produced by several glands in and around the eyelids. Environmental conditions, such as wind and dry climates, can also decrease tear volume due to increased tear evaporation. When the normal amount of tear production decreases or tears evaporate too quickly from the eyes, symptoms of dry eye can develop. Dry eyes are caused by a lack of adequate tears. Your tears are a complex mixture of water, fatty oils, and mucus. This mixture helps make the surface of your eyes smooth and clear, and it helps protect your eyes from infection. For some people, the cause of dry eyes is decreased tear production.
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