DefinitionTonometry is a test to measure the pressure inside your eyes. The test is used to screen for glaucoma.Alternative NamesIntraocular pressure (IOP) measurement; Glaucoma testHow the test is performedThere are several methods of testing for glaucoma.The applanation method measures the force required to flatten a certain area of the cornea. A fine strip of paper stained with orange dye is touched to the side of the eye. The dye stains the front of the eye to help with the examination, then rinses out with tears. An anesthetic drop is also placed in the eye.The slit-lamp is placed in front of you and you rest your chin and forehead on a support that keeps your head steady. The lamp is moved forward until the tonometer touches the cornea. The light is usually a blue circle. The health