Baerveldt (BGI) Valve Versus Ahmed(AGV) Valve in Management of Difficult Glaucoma Cases

A 350 mm2 Baerveldt glaucoma implant was placed in the superotemporal quadrant in 25 patients randomized to BGI group. A limbus-based conjunctival flap was dissected, and the implant was sutured to sclera 10 mm posterior to the limbus. A scleral graft was used to cover the limbal portion of the tube, and the conjunctiva was closed.

A 184 mm2 Ahmed glaucoma implant was placed in the superotemporal quadrant in 56 patients randomized to AGV group. A fornix-based conjunctival flap was dissected, and the implant was sutured to sclera 10 mm posterior to the limbus. The Ahmed tube left patent and viscoelastic substance injected into anterior chamber. A scleral graft was used to cover the limbal portion of the tube, and the conjunctiva was closed.