Icare versus Goldmann in a randomised middle-aged population The influence of central corneal thickness and refractive errors
- 1 May 2021
- journal article
- research article
- Published by SAGE Publications in European Journal of Ophthalmology
- Vol. 31 (3), 1231-1239
- https://doi.org/10.1177/1120672120921380
Abstract
Purpose The aim of this study was to compare the measurements of intraocular pressure by two tonometers, the Icare rebound tonometer and the Goldmann applanation tonometer, in a randomised screening study. The influence of refraction and central corneal thickness on the measurements was also evaluated. Methods Intraocular pressure was measured with rebound tonometer and Goldmann applanation tonometer in 1266 participants; refraction and central corneal thickness were also determined. One randomised eye of each participant was selected for this report's analysis. A Bland-Altman plot was used to compare the values obtained with the two devices. Results The correlation between rebound tonometer and Goldmann applanation tonometer was good: the intraclass correlation coefficient (r) between the two methods was 0.735 (p < 0.001). The mean difference (rebound tonometer-Goldmann applanation tonometer) was 0.11 +/- 2.3 mmHg. The difference was not statistically significant (95% confidence interval: 0.11 to 0.13,p = 0.09). With increasing central corneal thickness, not only did intraocular pressure values with both devices increase, but the difference between them also increased. Refraction (spherical equivalent) did not influence intraocular pressure or the rebound tonometer-Goldmann applanation tonometer difference. However, high astigmatism (>= 2D) exerted an influence on intraocular pressure values taken with Goldmann applanation tonometer. Conclusion Measurements with rebound tonometer and Goldmann applanation tonometer are relatively uniform although rebound tonometer slightly overestimated intraocular pressure. Both rebound tonometer and Goldmann applanation tonometer and the difference between these devices were affected by central corneal thickness but not by refraction. Higher astigmatism affected Goldmann applanation tonometer more than rebound tonometer. It is concluded that rebound tonometer is a reliable method for measuring intraocular pressure in a population-based screening study.This publication has 32 references indexed in Scilit:
- The Northern Finland Birth Cohort Eye Study: Design and baseline characteristicsBMC Ophthalmology, 2013
- The Effect of Thin, Thick, and Normal Corneas on Goldmann Intraocular Pressure Measurements and Correction Formulae in Individual EyesOphthalmology, 2012
- Poor utility of intraocular pressure correction formulae in individual glaucoma and glaucoma suspect patientsClinical & Experimental Ophthalmology, 2011
- The iCare rebound tonometer: comparisons with Goldmann tonometry, and influence of central corneal thicknessClinical & Experimental Ophthalmology, 2009
- Pascal, ICare and Goldmann applanation tonometry – a comparative studyActa Ophthalmologica, 2008
- Comparison of the rebound tonometer with the Goldmann applanation tonometer in glaucoma patientsClinical & Experimental Ophthalmology, 2007
- Comparison of rebound tonometry with Goldmann applanation tonometry and correlation with central corneal thicknessBritish Journal of Ophthalmology, 2006
- Comparison of ICare Tonometer with Goldmann Applanation Tonometer in Glaucoma PatientsJournal of Glaucoma, 2006
- Corneal astigmatism in applanation tonometryEye, 2003
- ON REPEATED TONOMETRYActa Ophthalmologica, 1971