intraocular pressure, the internal pressure of the eye, regulated by resistance to the flow of aqueous humor through the fine sieve of the trabecular meshwork. Contraction or relaxation of the longitudinal muscles of the ciliary body affects the size of the opening in the meshwork. In older persons the trabecular meshwork may become sclerotic and obstructed, preventing the normal flow of aqueous humor from passing out at the proper rate and causing an increase in the intraocular pressure. See also glaucoma.
