Tonometry

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Related to Applanation Tonometry: tonometer, acoustic neuroma

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 ?
In order to define the factors leading to the observed reduction in arterial stiffness, we carried out multiple regression analysis in which we determined the effect on the arterial stiffness index (carotid-femoral PWV) other changes observed in the study group such as office SBP, office DBP, BMI, Serum ADMA concentration, microalbuminuria, hs-CRP and applanation tonometry indices.
The relative effects of corneal thickness and age on Goldmann applanation tonometry and dynamic contour tonometry.
Of those, 12 patients would have had elevated IOP confirmed by Goldmann applanation tonometry and 10 would have been identified as false positives.
Schirmer tear test type I readings and intraocular pressure values assessed by applanation tonometry (Tonopen XL) in normal eyes of four European species of birds of prey.
Comparison of Nidek NT-3000 non-contact tonometer with Goldmann applanation tonometry.
All patients underwent detailed ophthalmologic examination including ocular history, visual acuity testing, slit-lamp biomicroscopy for evidence of pseudoexfoliatory material on the edge of the pupil or lens, applanation tonometry and indirect funduscopy In patients suspected of glaucoma and/or diagnosed with PXS, an additional examination was carried out including gonioscopy and visual field testing.
IOP measurements: The IOP of both eyes were recorded using Goldmann applanation tonometry (HAAG-STREIT, Swiss).
Applanation tonometry and correction according to corneal thickness Acta Ophthalmol Scand.
Referral may be based on optic nerve head damage, a visual field defect consistent with glaucoma or an inner eye pressure of 24mmHg or more using Goldmann-type applanation tonometry.
Goldmann Applanation tonometry has been considered to be the gold standard for determining IOP.
Intraocular pressure measured by applanation tonometry was 14 mmHg in the right and 17 mmHg in the left eye.
The post-operative data of intraocular pressure, proliferative vitreo-retinopathy, emulsification of silicone oil, band keratopathy and corneal de-compensation were recorded through detailed ocular examination using slit-lamp bi-omicroscopy with applanation tonometry and indirect ophthalmoscopy.