Tonometry

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Related to applanation tonometer: tonometry, Schiotz tonometer

Tonometry

 

the measurement of pressure—usually referring specifically to intraocular pressure. All tonometric methods are based on measurement of the eyeball’s capacity for deformation.

The approximate magnitude of intraocular pressure can be estimated by digital tonometry—the examiner making a subjective judgment of the degree of firmness of the eye by pressing it with the fingers. Greater accuracy in tonometry is achieved by the use of tonometers of varying design. Impression tonometry measures the degree of indentation of the eyeball produced by the tonometer rod and translates the reading into measures of intraocular pressure. Applanation tonometry measures the extent to which the eye can be flattened; the imprint (or tonogram) produced by a cylinder’s pressure on the eye is in the shape of a small circle, whose dimensions are converted into an index of pressure.

References in periodicals archive ?
Comparison of the rebound tonometer (ICare) to the applanation tonometer (Tonopen XL) in normotensive dogs.
The patients then underwent IOP measurement with Goldmann Applanation tonometer (HAAG-STREIT AT 900, koeniz switzerland) after instilling local anesthetic in each patient's eyes and application of fluorescein strips to eyes, about half an hour following IOP measurement with Air Puff tonometer (APT) in order to prevent IOP lowering which may occur following IOP measurement with APT.
Wan, "Comparison of intraocular pressure measurements and assessment of intraobserver and interobserver reproducibility the and Goldmann Applanation Tonometer in glaucoma patients," Journal of Glaucoma, vol.
A single member of the physician staff (M.E.R.) then conducted IOP measurements for each patient using a properly calibrated Goldmann applanation tonometer (Haig-Streit, Bern, Switzerland) mounted on a slit lamp (Marco-V, Jacksonville, Fla).
Comparison of the ocular response analyzer and the Goldmann applanation tonometer for measuring intraocular pressure after deep anterior lamellar keratoplasty Invest Ophthalmol Vis Sci.
The influence of corneal thickness and curvature on the difference between IOP measurements obtained with a non-contact tonometer and those with a Goldmann applanation tonometer. Nippon Ganka Gakkai Zasshi 2000;104(5):317-23.
Ocular hypertension was defined as IOP measured by Goldmann applanation tonometer higher than 22mmHg after correction for central corneal thickness (CCT) using Kohlhaas et al.'s correction formula with Dresdner correction table [9], with normal visual field, normal appearance of ONH, and normal retinal nerve fiber layer thickness (RNFL) by OCT [10].
Base line IOP was measured by Goldman applanation tonometer. Pupil was dilated with 1% tropicamide eye drops.
Intraocular pressure measurement in sheep using an applanation tonometer. Revista Ceres, v.58, n.6, p.678-679, 2011.
The Goldmann applanation tonometer (GAT) remains the gold standard for IOP measurement, but there are so many patients, you just can't get on a chin rest.
Then by applying applanation tonometer the IOP of the rabbits was recorded.
In general, contact tonometry in these cases was performed with either the Schiotz tonometer or the crystal-tipped applanation tonometer. In contrast, the pneymatonometer (a contact tonometer that contacts and applanates the patient's cornea with air pressure through a silicone-rubber membrane; it is distinct from the "puff" noncontact tonometer used by optometrists) has been associated with only one previous nosocomial EKC outbreak [7].