What is a major function of the meibomian glands?

The major function of the meibomian glands is to secrete lipids. Located in the tarsal plates of the eyelids, these glands play a crucial role in maintaining the stability of the tear film. The lipids they produce form the outer oily layer of the tear film, which helps prevent the evaporation of the aqueous layer beneath it. This lipid layer reduces tear film break-up and enhances overall ocular comfort and health. Without sufficient lipid secretion, the tear film may become unstable, leading to symptoms of dry eye and discomfort. Understanding this function is vital in the context of ocular physiology and the comprehensive management of eye health.