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Tears flow from tear glands into your eyes through tiny tear ducts. The tear glands are located under your upper lids, and when stimulated, produce tears to form a thin film over your eyeballs. Every time you blink the film spreads over your eyes to keep them moist and free of dust and other irritants.
The tear film is kept stable by mucin which is secreted by a thin membrane covering the front of the eye, called the conjunctiva. Dry eyes result from a reduced production of tears, a reduced production of mucin by the conjunctiva, or increased evaporation of tears from the surface of the eye.