Comparison of the Outcome of Silicone Ahmed Glaucoma Valve Implantation with a Surface Area between 96 and 184 mm2 in Adult Eyes

Glaucoma is a leading cause of irreversible blindness worldwide [1]. For the surgical treatment of glaucoma, fil-tering surgery, such as trabeculectomy, is performed as a standard procedure. However, in cases of intractable glau-coma, including neovascular glaucoma, uveitic glaucoma, aphakic or intraocular lens glaucoma, and glaucoma after penetrating keratoplasty, it has been reported that the suc-cess rate of trabeculectomy is low [2-6]. An aqueous out-flow device was first used to treat intractable glaucoma by Zorab in 1912 [7]. Since then, various aqueous outflow de-vices have been developed for intraocular pressure (IOP) reduction in glaucoma refractory to glaucoma filtering surgeries [8]. The Ahmed glaucoma valve (AGV; Ne