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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.
1 Eye pressure. 2  Tonometry measures the pressure in the eye (intraocular pressure, or IOP). 3  Vision tests. 4  These include tests to check for visual acuity and loss of side and central vision (perimetry testing).arly detection and treatment of glaucoma are important for controlling the condition and preventing blindness. A doctor evaluating possible glaucoma will take a medical history and do a physical exam. If your doctor suspects glaucoma, he or she will refer you to an eye specialist (ophthalmologist).