The layer of tears covering the cornea (surface of the eye). See also basal tears, as these are the tears that comprise the tear film.
DISCUSSION
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 epithelium.
A stable, balanced tear film is essential for vision, eye health, and comfort.
Any abnormality of any part of the apparatus that makes the tear film is called ocular surface disease and may cause symptoms referred to as dry eye.
