A Comparative Analysis of Goldmann Tonometry Correction

Asejczyk-Widlicka, Magdalena and Srodka, Wieslaw and Pierscionek, Barbara K. (2017) A Comparative Analysis of Goldmann Tonometry Correction. Journal of Glaucoma, 26 (3). pp. 233-240. ISSN 1536-481X

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Official URL: https://doi.org/10.1097/IJG.0000000000000588

Abstract

Purpose: The measurement of intraocular pressure (IOP) by Goldmann applanation tonometry (GAT) is based on assumptions about corneal parameters. To correct for variations in corneal curvature and thickness, a number of equations have been proposed. This study evaluates the in vivo accuracy of these equations from individuals with primary open-angle glaucoma and compared them with measurements taken using the Pascal dynamic contour tonometer (DCT), which makes no assumptions about the corneal geometry or biomechanics. Participants and Methods: The study included 108 participants with primary open-angle glaucoma (47 male and 61 female) with an age range of 39 to 81 years. Participants were recruited from the Glaucoma Clinic at Wroclaw Medical University. A full ophthalmologic examination was conducted on all participants. Participants were divided into 3 groups depending on IOP as measured by GAT. Six formulae were applied and the results were compared with measurements taken with DCT. Main Outcome Measures: To determine as to which formula provides the closest value to IOP measured with DCT. Results: For IOP values ≤29 mm Hg, 2 of the formulae showed the smallest and comparable mean differences and SDs between corrected IOP values obtained with GAT and those measured with DCT. For IOP≥30 mm Hg, the formula derived from the model of corneal applanation that takes into account corneal buckling showed the closest agreement with measurements taken using DCT. Conclusions: Correction formulae provide widely varying results and their appropriateness can depend on the IOP values.

Item Type: Journal Article
Keywords: intraocular pressure, glaucoma, Goldmann applanation tonometry, dynamic contour tonometry, Goldmann correction
Faculty: ARCHIVED Faculty of Health, Social Care & Education (until September 2018)
Depositing User: Lisa Blanshard
Date Deposited: 18 Feb 2021 14:57
Last Modified: 09 Sep 2021 16:12
URI: https://arro.anglia.ac.uk/id/eprint/706289

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