IOP Reduction and Complications of Polymethyl Methacrylate GDD on Glaucoma Patient

The study is to measure the efficacy of new GDD that made with polymethyl methacrylate. The primary outcome is IOP reduction. The secondary outcome is glaucoma medication post surgery and complication that occurred during the follow up. The subjects are refractory glaucoma patients that need glaucoma drainage device implantation. The measurement are collected on first day, first month, third month, sixth month and twelve month. The IOP will be measured using GAT (Goldmann applanation tonometer), but if the subjects are not cooperative, they will be measured using i-care. On the follow up, the glaucoma medication needed will be noted and also for the complication and the need for other surgery, e.g. AC formation using viscoelastic, repair tube/plate exposure, cyclo photocoagulation, etc.