 Screening for glaucoma is usually performed as part of a standard eye examination performed by optometrists and ophthalmologists.Testing for glaucoma should include measurements of the intraocular pressure via tonometry, anterior chamber angle examination or gonioscopy, and examination of the optic nerve to look for any visible damage to it, or change in the cup-to-disc ratio and also rim appearance and vascular change.A formal visual field test should be performed.