Original Research

Intra-ocular pressure measurements using the Ocular Response Analyser and ICare tonometer: A comparison

Wayne D.H. Gillan
African Vision and Eye Health | Vol 74, No 1 | a29 | DOI: https://doi.org/10.4102/aveh.v74i1.29 | © 2015 Wayne D.H. Gillan | This work is licensed under CC Attribution 4.0
Submitted: 05 November 2014 | Published: 03 June 2015

About the author(s)

Wayne D.H. Gillan, Department of Optometry, University of Johannesburg, South Africa


The accurate measurement of intra-ocular pressure (IOP) is an important procedure in the detection and treatment of glaucoma. The Ocular Response Analyser (ORA) and the ICare rebound tonometer are two recent additions to the instruments available to eye care practitioners for the measurement of IOP. The present study investigated whether the ORA and the ICare tonometer can be used interchangeably. Twenty-eight subjects had three measures of IOP taken using the two instruments. The ORA provides two different measures of IOP – Goldmann and cornea compensated IOP – whilst the ICare tonometer provides IOP only. The results of this study suggest that only the ORA Goldmann and ICare IOP measures are comparable. In general, it is advisable not to use the ORA and ICare tonometers interchangeably.


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