1. A drain valve (10) surgically implanted in a patients eye (O) for the treatment of glaucoma, comprising a main body (11) and one end (12 ) connected to the main body (12), the distal tip thereof entering into the anterior chamber (CA) of the eyeball (GO) and the discharge of the aqueous humor (UA) to the outside is detected by the discharge pipe The valve (10) is designed to be implanted in the eye (O) so as to be possible, the valve (10) being characterized by the following series of significant improvements: 1) during the surgical procedure in which the valve (10) (12a, 12b) of the discharge tube (12) allowing for a fitting (f1) of the length of the discharge tube (12) 2) a radial direction of the discharge pipe (12) with respect to the surface of the eye (GO) Flat or flat cross-sectional shape (12 ) of the discharge tube (12, 12a, 12b) suitable for reducing the size of the eye (IR) of the eye (3) 3) A connection without any obstructions between the tip part (12f) of the discharge pipe (12) and the remaining part (12b ) of the discharge pipe (12) 4) the main part in contact with the surface of the eye (GO) A series of holding bags or compartments (11b) formed along the lower or lower end face (S ") of the body (11), extending through this main body (11) of the valve A series of holding bags suitable for receiving and holding the aqueous humor (UA) so as to improve the lubrication of eyeballs in the zone of the valve, in relation to the through-hole (11a) and when implanted, 5) When implanted, in order to transfer the aqueous humor (UA) to improve the lubrication around the drain valve (10), the main body of the valve (11 Sudden fan-shaped opening (11 c) formed in the outer ring (S ) of the outer ring (6) For example, a modified structure for a conventional drain valve that allows for placement close to the iris of a hole (11 d) for inserting a thread for fixing a valve to the surface of an eyeball during a surgical operation. With these improvements, the drain
