Comparison of Goldmann applanation tonometry and Pascal dynamic contour tonometry in relation to central corneal thickness and corneal curvature
Authors Andreanos K, Koutsandrea C, Papaconstantinou D, Diagourtas A, Kotoulas A, Dimitrakas P, Moschos MM
Received 17 June 2016
Accepted for publication 26 July 2016
Published 9 December 2016 Volume 2016:10 Pages 2477—2484
Checked for plagiarism Yes
Review by Single-blind
Peer reviewer comments 2
Editor who approved publication: Dr Scott Fraser
Konstantinos Andreanos, Chryssanthi Koutsandrea, Dimitris Papaconstantinou, Andreas Diagourtas, Andreas Kotoulas, Panagiotis Dimitrakas, Marilita M Moschos
First Department of Ophthalmology, University of Athens, “G. Gennimatas” General Hospital of Athens, Athens, Greece
Purpose: The aim of the study was to assess the influence of central corneal thickness (CCT) and corneal curvature in tonometry measurements taken by Goldmann applanation tonometry (GAT) and Pascal dynamic contour tonometry (DCT).
Methods: This was a prospective study of 185 eyes from 97 subjects, attending outpatient ophthalmology appointments, who underwent intraocular pressure measurements by GAT and Pascal DCT. CCT and corneal curvature were obtained using ultrasound pachymetry and Orbscan topography, respectively. All measurements were carried out among males and females during the period 2009–2012. Apart from the usual descriptive and exploratory data analysis, one-way analysis of variance and agreement analysis were performed, linear as well as intraclass correlation coefficients were estimated, and multiple scatter and Bland–Altman plots were produced.
Results: Mean IOP measurements obtained were 17.21±4.10 mmHg by DCT and 13.23±4.07 mmHg by GAT. Mean difference between the GAT and DCT measurements was 3.88±2.8 mmHg. Mean CCT and corneal curvature were 522.78±52 µm and 43.83±2.9823 D, respectively.
Conclusion: Intraocular pressure measured by GAT was consistently lower when compared with DCT, and this difference was greatest with thinner CCT. Flat corneas seem to influence GAT measurements compared to DCT.
Keywords: glaucoma, Goldmann, Pascal, tonometry
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