FIELD : medicine.SUBSTANCE : invention relates to medicine, namely to ophthalmology, for prevention of parietal hyperfiltration of intraocular fluid in antiglaucomatous operations with implantation of valve-type drainage Ahmed? Glaucoma Valve implantation of valve base, insertion of a drain tube (DT) into an anterior chamber through an intrascleral canal formed by 23 Ga needle. Intrascleral canal is formed at 6?mm from the limb, and after insertion of DT into an anterior chamber and a conjunctival closure, a nasal conjunctival suture is applied, embracing the DT and capturing the sclera. DT is cut at angle of 30?EFFECT : method enables to prevent DT displacement, provides preventive maintenance of parietal hyperfiltration of intraocular liquid in early postoperative period, higher effectiveness of surgical intervention and reduced risk of postoperative complications.1 cl, 2 ex