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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). Tonometry measures the pressure in the eye (intraocular pressure, or IOP). 2  Vision tests. 3  These include tests to check for visual acuity and loss of side and central vision (perimetry testing). 4  Cornea thickness. 5  Tests such as ultrasound pachymetry measure the thickness of the clear front surface of the eye (cornea).