Background.The implantation of various drainage devices is one of the treatments for refractory glaucoma, resistant to traditional surgical methods. The most commonly used glaucoma drainage device for refractory glaucoma includes the Ahmed glaucoma valve. However, the long-term success rate of the surgery may be limited because of the development of complications during the late postoperative period. The complications do not allow to control the achieved level of IOP. In such cases, repeated implantation of the Ahmed valve may be one of the options for surgical treatment. Clinical case description.The second Ahmed valve was implanted in two patients with refractory repeatedly operated glaucoma in the Department of Surgical glaucoma treatment of the "MNTK "Eye Microsurgery" in Moscow. Previously, the both patients had the Ahmed at the place of residence. During the postoperative period one patient was found to have an encapsulated cyst around the drainage body, and later the revision of the operation area was carried out. As a result of repeated implantation of the Ahmed valve was IOP compensation at 9 months after surgery. Conclusion.Repeated implantation of the Ahmed valve if the first implant failed to control IOP may be an option for surgical treatment to compensate IOP and preserve visual functions in patients with refractory repeatedly operated glaucoma.