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To retrospectively evaluate the efficacy and long-term complications of the Ahmed glaucoma valve (AGV) in refractory glaucoma. Seventy-eight eyes with glaucoma refractory to conventional surgical procedures (filtration surgery and diode laser cyclophotocoagulation) underwent AGV implantation between May 2006 and August 2018. The criteria for success were defined as an intraocular pressure (IOP) less than 18 mmHg and a decrease of at least 20% from the preoperative IOP. The criteria for failure were an IOP greater than