Lacrimal Gland, Tear Film, and Dry Eye Syndromes 2

During the past two decades, a significant international research effort has been di­ rected toward understanding the composition and regulation of the preocular tear film. This effort has been motivated by the recognition that the tear film plays an essential role in maintaining corneal and conjunctival integrity, protecting against microbial challenge, and preserving visual acuity. In addition, research has been stimulated by the knowledge that alteration or deficiency of the tear film, which