Inclusion Criteria:  Inclusion Criteria:  Patients with refractory glaucoma aging 18 years and older. Both sexes are included. Patients Capable of giving informed consent. Pseudophkic glaucoma. Aphakic glaucoma. Silicon oil induced glaucoma. Neovascular glaucoma. Inflammatory glaucoma.  Exclusion Criteria:  Patients <18 years of age. Patients controlled on regular antiglaucomatous therapy. Patients who cannot do regular follow up visits. Diffuse scleral staphyloma at the site of CPC.