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Medical Definition of Tonometry. Tonometry: A standard eye test that is done to determine the fluid pressure inside the eye. Increased pressure is a possible sign of glaucoma, a common and potentially very serious problem if not detected and treated promptly. The pressure inside the eye is measured from the outside.
Test Overview. A tonometry test measures the pressure inside your eye, which is called intraocular pressure (IOP). This test is used to check for glaucoma, an eye disease that can cause blindness by damaging the nerve in the back of the eye (optic nerve ).