The invention relates to a device for use in glaucoma surgery intended for implantation in the eye. The device comprises a flat head region (8), a probe (6) which adjoins the head region (8), and a relief channel (7) which extends through the head region (8) and the probe (6) and is open at both sides. The design and dimensions of the head region (8) and of the probe (6) are such that the probe (6) can be inserted by its free end through the sclera (4) into the posterior chamber (10) of the eye in order to reduce an excessive intraocular pressure when the conjunctiva (3) is open, and such that, in the inserted position, the lower side of the head region (8) comes into abutment with the sclera (4), and the upper side of the head region (8) can be covered by closing the conjunctiva (3) such that drainage can be performed from the posterior chamber (10) into a gap (11) between the conjunctiva (3) and the sclera (4).
