The layer of tears covering the cornea (surface of the eye).

The tear film is comprised of aqueous tears plus a lipid (oily) layer on top to retard evaporation and a mucin layer underneath to help spreading and adherence to the cornea.

A stable, balanced tear film is essential for vision, eye health, and comfort.

Any abnormality of any part of the apparatus that makes tear film is called ocular surface disease and may cause symptoms referred to as dry eye.

Tear film components: aqueous layer , lipid layer , mucin layer

Tear film abnormalities: keratoconjunctivitis sicca, ocular surface disease, dry eye syndrome

Patient FAQ: Dry eye for dummies

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Last updated 30 Nov 2004.