Glaucoma drainage implant surgery (GDIS) has substantially improvedthe treatment of patients with poor prognosis for standard filtering procedures,such as trabeculectomy. Early reports1-4 describedthe beneficial treatment of refractory or recalcitrant glaucoma with GDIS;neovascular glaucoma5 and juvenile glaucoma6-9; and glaucomaassociated with uveitis,10,11 penetratingkeratoplasty,12 epithelial ingrowth,13 aphakia or pseudophakia,14,15 andfailed filtering surgery.15 Recently, Wilsonet al16 published the results of a clinicaltrial that demonstrated the safety and efficacy of surgery using the Ahmedimplant compared with trabeculectomy for the initial surgical management ofprimary open-angle glaucoma.