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Purpose To evaluate the efficacy and safety of Ahmed glaucoma valve(AGV)implantation through pars plana for secondary glaucoma following lentectomy and vitrectomy surgery.Methods thirteen patients(13 eyes)who had been diagnosed secondary glaucoma after lentectomy and vitrectomy were selected in this study.The 13 eyes treated with AGV implantation through pars plana with follow-up of 6 months.