title: Comparison of Goldmann applanation tonometry and Pascal dynamic contour tonometry in relation to central corneal thickness and corneal curvature.
abstract: OBJECTIVE
  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.
  
  
  CONCLUSIONS
  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.
authors.affiliation: First Department of Ophthalmology, University of Athens, "G. Gennimatas" General Hospital of Athens, Athens, Greece.
authors.forename: Konstantinos
authors.initials: K
authors.lastname: Andreanos
authors.affiliation: First Department of Ophthalmology, University of Athens, "G. Gennimatas" General Hospital of Athens, Athens, Greece.
authors.forename: Chryssanthi
authors.initials: C
authors.lastname: Koutsandrea
authors.affiliation: First Department of Ophthalmology, University of Athens, "G. Gennimatas" General Hospital of Athens, Athens, Greece.
authors.forename: Dimitris
authors.initials: D
authors.lastname: Papaconstantinou
authors.affiliation: First Department of Ophthalmology, University of Athens, "G. Gennimatas" General Hospital of Athens, Athens, Greece.
authors.forename: Andreas
authors.initials: A
authors.lastname: Diagourtas
authors.affiliation: First Department of Ophthalmology, University of Athens, "G. Gennimatas" General Hospital of Athens, Athens, Greece.
authors.forename: Andreas
authors.initials: A
authors.lastname: Kotoulas
authors.affiliation: First Department of Ophthalmology, University of Athens, "G. Gennimatas" General Hospital of Athens, Athens, Greece.
authors.forename: Panagiotis
authors.initials: P
authors.lastname: Dimitrakas
authors.affiliation: First Department of Ophthalmology, University of Athens, "G. Gennimatas" General Hospital of Athens, Athens, Greece.
authors.forename: Marilita M
authors.initials: MM
authors.lastname: Moschos
keywords: Goldmann; Pascal; glaucoma; tonometry