a technique used to examine the structure of the angle, especially the trabecular meshwork where aqueous humor drains out of the eye. A special lens is placed on the front of the eye to observe the angle structures that can not normally be seen including: Schwalbe's line (the edge of the inside of the cornea); the trabecular meshwork; the scleral spur (a small white structure that connects the ciliary muscle to the trabecular meshwork); and the ciliary body band (part of the ciliary muscle through which some fluid drains). Gonio lens positioned on eye   View of angle drainage system

A diagnostic procedure using a mirror/lens device placed directly upon the cornea that is used to view the drainage area through which aqueous fluid exits the eyeball.

eye examination.