Inclusion Criteria:  22-80 years of age. moderate to severe refractory glaucoma Able to consent  Exclusion Criteria:  Women of child-bearing potential Intraocular surgery or laser within the last 3 months Ocular infection or inflammation within the last 6 months or currently active Current use of anti-coagulant therapy History of bleeding disorder or coagulopathies Subject plans to undergo any ocular surgery (including cataract surgery) during the study period History of corneal transplantation History of ICE Syndrome or epithelial ingrowth/downgrowth History of congenital glaucoma  Elevated episcleral venous pressure  -. Persistent angle closure-  Previous glaucoma filtration surgery- -Presence of conjunctival scarring - neovascular glaucoma AC lens or scleral sutured IOL Aphakia inability to DC contact lenses Presence of intraocular silicone oil Vitreous in AC