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measurement of tension or pressure, e.g., intraocular pressure.
digital tonometry estimation of the degree of intraocular pressure by pressure exerted on the eyeball by the finger of the examiner.
gastric tonometry monitoring of the gastric intramucosal pH to obtain early indications of inadequate tissue oxygenation; the sensitive nature of the mucosa allows for monitoring of metabolic changes produced by hypoxia well in advance of the other more common indices of hypoxia.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.


1. Measurement of the tension of a part, for example, intravascular tension or blood pressure.
2. Measurement of ocular tension.
Farlex Partner Medical Dictionary © Farlex 2012


Blood gases See Blood gas analysis Ophthalmology A technique that measures intraocular pressure–normal is ≤ 20 mm Hg by contact–indentation of, or applanation on or noncontact–by a puff of air on the outer part of the eye Indications Diagnose and manage glaucoma, ocular HTN, and in routine ocular examination.
McGraw-Hill Concise Dictionary of Modern Medicine. © 2002 by The McGraw-Hill Companies, Inc.


1. Measurement of the tension of a part (e.g., intravascular tension or blood pressure).
2. Measurement of ocular tension.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012


(tō-nom′ĕ-trē) [ tono- + -metry]
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TONOMETRY: Measuring intraocular eye pressure
The measurement of tension of a part, as intraocular tension, used to detect glaucoma. See: illustration

analytical tonometry

A technique formerly used in blood gas analysis in which the liquid blood sample and its gas are held at equilibrium and the partial pressures of oxygen and carbon dioxide are measured.

applanation tonometry

Determining intraocular pressure by measuring the force necessary to flatten the corneal surface.

digital tonometry

Determining intraocular pressure by use of the fingers.

gastric tonometry

Measurement of the partial pressure of carbon dioxide (Pco2) in the stomach of critically ill patients to determine how well the stomach and other internal organs are perfused with blood and oxygen. Poor gastric perfusion is found in more severe conditions, i.e., those that carry an increased risk of death.

noncontact tonometry

Determining intraocular pressure by measuring the degree of indentation of the cornea produced by a puff of air.
Medical Dictionary, © 2009 Farlex and Partners


Measurement of the pressure of the fluid within the eye.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005


The measurement of pressure.
Mentioned in: Glaucoma
Gale Encyclopedia of Medicine. Copyright 2008 The Gale Group, Inc. All rights reserved.


Measurement of intraocular pressure with a tonometer. See intraocular pressure; tonometer.
Millodot: Dictionary of Optometry and Visual Science, 7th edition. © 2009 Butterworth-Heinemann