Evaluation of Safety and Efficacy of Glaucoma Shunt (Aurolab Artificial Drainage Implant) in Refractory Glaucoma

Inclusion Criteria: * 18 years of age or older * Significant optic nerve damage and visual field loss due to glaucoma in eligible eyes * Eligible eyes is considered at high risk of failure/complication following conventional filtering surgery * Eyes with uncontrolled glaucoma with prior history of Filtering surgery/Uveitic/ Neovascular/Developmental glaucomas * IOP≥18 mm of Hg with or without anti glaucoma medications * If taking glaucoma medications, stable dose for 6 weeks Exclusion Criteria: * Age\<18 years * Eyes with uncontrolled glaucoma expected to have favorable post-operative outcome by conventional trabeculectomy * Corneal abnormalities that would preclude accurate IOP readings * Uncontrolled systemic diseases * Endothelial cell count\<1800cells/mm * Any other active ocular disease,(active uveitis, ocular infection)