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It is an important test in the evaluation of patients at risk from glaucoma. [1] Most tonometers are calibrated to measure pressure in millimeters of mercury , with the normal eye pressure range between 10 and 21 mmHg (13–28 hPa).
A patient in front of a tonometer. Intraocular pressure (IOP) is the fluid pressure inside the eye. Tonometry is the method eye care professionals use to determine this. IOP is an important aspect in the evaluation of patients at risk of glaucoma. [1] Most tonometers are calibrated to measure pressure in millimeters of mercury .
Intraocular pressure (IOP) can be measured by tonometry devices. The eye can be thought of as an enclosed compartment through which there is a constant circulation of fluid that maintains its shape and internal pressure. Tonometry is a method of measuring this pressure using various instruments. The normal range is 10-21 mmHg.
Schiøtz tonometer is an indentation tonometer, used to measure the intraocular pressure (IOP) by measuring the depth produced on the surface of the cornea by a load of a known weight. The indentation of corneal surface is related to the IOP.
Ocular hypertension is the presence of elevated fluid pressure inside the eye (intraocular pressure), usually with no optic nerve damage or visual field loss. [ 1 ] [ 2 ] For most individuals, the normal range of intraocular pressure is between 10 mmHg and 21 mmHg. [ 3 ]
Low-tension glaucoma MH Macular hole MI Myocardial infarction MS Multiple sclerosis NIDDM Non-insulin-dependent diabetes mellitus NRR Neuro-retinal rim NS Nuclear sclerosis: NTG Normal tension glaucoma: PDR Proliferative diabetic retinopathy PDT Photodynamic therapy: PK Penetrating keratoplasy: POAG Primary open-angle glaucoma PPDR
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Goldmann Applanation Tonometer attached with Slit lamp biomicroscope Goldmann Applanation Tonometer is an instrument that is based on Imbert-Fick law . It is considered to be the gold standard instrument for measurement of Intraocular pressure (IOP).