- Ø Secondary Glaucoma (Uveitic, Neovascular, traumatic, Iridocorneal Endothelial Syndrome); Congenital Glaucoma Ø Severe ocular disease like Proliferative Diabetic Retinopathy, Age-related Macular Degeneration Exudative type Ø Prior intraocular surgery(in the study eye) Ø Patients with small central island and temporal field remaining on perimetry Ø One-eyed patients or fellow eye with visual acuity of counting fingers (CF) or worse