The glaucoma is a disease of the eye that is accompanied by a temporal or a chronical increase of intraocular pressure. The excavation of the optical nerve papilla can lead to atrophy and scotoma as well as sight loss. In ophthalmoscopy the papilla seems pale, the vessel funnel deepened and the vessels blocked. Causes can be obstructions of the aqueous humour (primary glaucoma) or a complication during another eye disease (secondary glaucoma). The aqueous humour is physiologically released into the posterior eye chamber and circulates through the pupil in the anterior eye chamber (see blue arrows) in the iridocorneal angulus (see angel close to the tiny blue dots) it is physiologically resorbed by Schlemm’s canal and added to the venous system (Plexus venosus sclerae). If the angel is obstructed, chamber water accumulates which causes the increased pressure (see picture and obstructed flow).