Comparison of intraocular pressure measurement between rebound, non-contact and Goldmann applanation tonometry in treated glaucoma patients

Vincent, Stephen, Vincent, Roslyn, Shields, David, & Lee, Graham (2011) Comparison of intraocular pressure measurement between rebound, non-contact and Goldmann applanation tonometry in treated glaucoma patients. Clinical and Experimental Ophthalmology, 40(4), e163-e170.

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Background: To compare the intraocular pressure readings obtained with the iCare rebound tonometer and the 7CR non-contact tonometer with those measured by Goldmann applanation tonometry in treated glaucoma patients.

Design: A prospective, cross sectional study was conducted in a private tertiary glaucoma clinic.

Participants: 109 (54M:55F) patients including only eyes under medical treatment for glaucoma.

Methods: Measurement by Goldmann applanation tonometry, iCare rebound tonometry and 7CR non-contact tonometry.

Main Outcome Measures: Intraocular pressure.

Results: There were strong correlations between the intraocular pressure measurements obtained with Goldmann and both the rebound and non-contact tonometers (Spearman r values ≥ 0.79, p < 0.001). However, there were small, statistically significant differences between the average readings for each tonometer. For the rebound tonometer, the mean intraocular pressure was slightly higher compared to the Goldmann applanation tonometer in the right eyes (p = 0.02), and similar in the left eyes (p = 0.93) however these differences did not reach statistical significance. The Goldmann correlated measurements from the noncontact tonometer were lower than the average Goldmann reading for both right (p < 0.001) and left (p > 0.01) eyes. The corneal compensated measurements from the non-contact tonometer were significantly higher compared to the other tonometers (p ≤ 0.001).

Conclusions: The iCare rebound tonometer and the 7CR non-contact tonometer measure IOP in fundamentally different ways to the Goldmann applanation tonometer. The resulting IOP values vary between the instruments and will need to be considered when comparing clinical versus home acquired measurements.

Impact and interest:

20 citations in Scopus
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11 citations in Web of Science®

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ID Code: 46323
Item Type: Journal Article
Refereed: Yes
Keywords: intraocular pressure, Goldmann applanation tonometer, rebound tonometer, non-contact tonometer, glaucoma, self-tonometry
DOI: 10.1111/j.1442-9071.2011.02670.x
ISSN: 1442-6404
Subjects: Australian and New Zealand Standard Research Classification > MEDICAL AND HEALTH SCIENCES (110000) > OPTOMETRY AND OPHTHALMOLOGY (111300)
Divisions: Current > QUT Faculties and Divisions > Faculty of Health
Current > Institutes > Institute of Health and Biomedical Innovation
Current > Schools > School of Optometry & Vision Science
Copyright Owner: 2011 Royal Australian and New Zealand College of Ophthalmologists
Copyright Statement: The definitive version is available at
Deposited On: 05 Oct 2011 22:54
Last Modified: 26 Jun 2012 23:38

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