Also found in: Dictionary, Thesaurus, Encyclopedia, Wikipedia.
Related to tonometry: Applanation Tonometry


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.


1. Measurement of the tension of a part, for example, intravascular tension or blood pressure.
2. Measurement of ocular tension.


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.


1. Measurement of the tension of a part (e.g., intravascular tension or blood pressure).
2. Measurement of ocular tension.


(tō-nom′ĕ-trē) [ tono- + -metry]
Enlarge picture
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.


Measurement of the pressure of the fluid within the eye.


The measurement of pressure.
Mentioned in: Glaucoma


Measurement of intraocular pressure with a tonometer. See intraocular pressure; tonometer.
References in periodicals archive ?
Bland-Altman plots were used to show the difference between tonometry and manometry.
Intraocular pressure in captive black-footed penguins (Spheniseus demersus) measured by rebound tonometry. Journal of Avian Medicine and Surgery, v.24, n.2, p.138-41, 2010.
Table 1: Average intraocular pressure (a) in the involved eyes of patients with hemifacial spasm before and after Botox injections using Goldmann applanation tonometry and noncontact air puff tonometry.
The SphygmoCor[R] device has a built in a highly sensitive tonometry sensor used for pulse wave measurement.
Effect of Central Corneal Thickness on Dynamic Contour Tonometry and Goldmann Applanation Tonometry in Primary Open-angle Glaucoma.
Comparison of intraocular pressure measurement between rebound, non-contact and Goldmann applanation tonometry in treated glaucoma patients.
As highlighted in Figure 1 and Table 1, the baseline values of tonometry measurements, recorded at (T1), showed a mean IOP of 16 [+ or -] 2.23 mmHg while climbing up to 18,000 feet IOP mean value was 13.7 [+ or -] 4.17 mmHg (T2).
In patients born by cesarean section--results of tonometry was more common in norm.
All patients underwent standard ophthalmological examination including tonometry, perimetry, biomicroscopy and gonioscopy; washing-out of nasolacrimal duct being performed to assess its patency.