“…Systematic review of reliable literature on glaucoma drainage devices has demonstrated that the overall surgical success rates range between 60-90% in a period of 12-27 months after surgery, with a yearly failure rate of 10 percent in subsequent years, almost regardless of the type of implant used and even in combination with simultaneous cataract surgery [16,31,37,81,89]. Even the rates of major complications such as hypotony, suprachoroidal hemorrhage, and decrease of visual acuity were comparable for the different devices, although a higher percentage of diplopia occurred after use of the larger Baerveldt implants.…”