Topics: Retinal nerve fiber layer, TONOMETRY, perkins Tonometer, gonioscopy, Ophthalmoscopy, fundoscopy, Normal optic disc, Pallor, cupping, Glaucomatous optic nerve head appearance, Glaucomatous Optic Neuropathy, Glaucomatous optic disc, Static perimetry, Kinetic perimetry, PRIMARY OPEN-ANGLE GLAUCOMA, OCULAR HYPERTENSION, LOW TENSION GLAUCOMA, STEROID-INDUCED GLAUCOMA, UVEITIC GLAUCOMA, Neovascular glaucoma, Cholinergic Agonists, Carbonic Anhydrase Inhibitors