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| The aqueous humour is a thick watery substance that is located
in the anterior and posterior chambers of the eye between the
cornea and the lens. Variations in the efficiency of the liquid
can effect vision. The anterior segment is the front third of
the eye that includes the structures in front of the vitreous
humour: the cornea, iris, ciliary body, and lens. Within the
anterior segment are two fluid-filled spaces divided by the iris
plane: - 1) the anterior chamber between the posterior surface
of the cornea (i.e. the corneal endothelium) and the iris. - 2)
the posterior chamber between the iris and the front face of the
vitreous. - Maintains the intraocular pressure and inflates the
globe of the eye. - Provides nutrition for the avascular ocular
tissues; posterior cornea, trabecular meshwork, lens, and
anterior vitreous. - Carries away waste products from metabolism
of the above ava