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Ocular structures related to dry eye. The three main components of the tear film are the lipid layer, the aqueous layer, and the mucous layer, which are produced by the meibomian glands, the lacrimal gland, and the conjunctival goblet cells, respectively. Decreased tear production by the lacrimal gland results in less eye surface lubrication. Additionally, decreased oil secretion by meibomian glands leads to excess tear evaporation.
