tonometer /to·nom·e·ter/ (to-nom´ĕ-ter) an instrument for measuring tension or pressure, particularly intraocular pressure.
air-puff tonometer an instrument for measuring intraocular pressure by sensing deflections of the cornea in reaction to a puff of pressurized air.
applanation tonometer an instrument that measures intraocular pressure by determination of the force necessary to flatten a corneal surface of constant size.
impression tonometer , indentation tonometer an instrument that measures intraocular pressure by direct pressure on the eyeball.
| applanation tonometer n. An instrument for determining intraocular tension by measuring the pressure required to flatten a small area of the cornea. |
tonometer
an instrument for measuring tension or pressure, especially intraocular pressure.
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Principles of the tonometer. By permission from Guyton R, Hall JE, Textbook of Medical Physiology, Saunders, 2000
applanation tonometer
measures the force required to flatten or applanate an area of cornea. Includes the MacKay-Marg, Halberg, Dräger and Goldmann tonometers.
indentation tonometer
measures the pressure required to indent the cornea; includes the Schiotz and pneumatonograph.
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