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What is the tear film, and why is it important? Written by an ACVO Member HERE'S WHY: A. The tear film is the liquid coating of the cornea or clear anatomical structure of the eye. As the cornea is an avascular structure with no direct blood supply, it requires the tear film for lubrication and nutrition which are crucial to eye health. If there is an abnormal tear film or a decrease in its three components, ocular surface disease occurs. B. The tear film is composed of three integrated layers that work closely together. A disruption in one or more of these layers, greatly affects the quality of the others. 1. Lipid layer - thin oily outer layer secreted by the Meibomian glands at the margin of the eyelids.