Fig. 26. Tears are produced by accessory and main lacrimal glands (1). The distribution of these tears over the surface of the eye is achieved by movements of the eyelids (2) that spread the marginal tear bead (inset) shown here in optical cross section by a slit lamp beam. The passage of tears into the nose occurs via the lacrimal drainage system. (From Zide BM, Jelkes G. Surgical Anatomy of the Orbit. New York: Raven Press, 1985.)