Clinical comparison of the Ocuton self-tonometer with Goldmann tonometry: [conference paper]

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    Background: The purpose of the present paper was to compare intraocular pressure (IOP) measurements obtained in a clinical setting using the Ocuton S self-tonometer with Goldmann tonometry and to assess patient handling and reliability of the Ocuton S self-tonometer. Methods: A total of 85 patients was recruited to attempt self-tonometry with the Ocuton S self-tonometer, following IOP measurement with the Goldmann tonometer by one of the authors. Patients were verbally instructed in the use of the instrument and were observed while obtaining up to three measurements with the Ocuton S. A maximum of six attempts to obtain the three measurements was permitted, with no time limit. The mean of the three measurements was obtained and compared with the measurement obtained by Goldmann tonometry. Results: Eighty mean measurements were obtained from 70 patients. Fifteen patients were unable to obtain any measurement with the Ocuton S self-tonometer. The mean Ocuton S measurements correlated reasonably well with those obtained by Goldmann tonometry (r - 0.776, P < 0.001). The number of attempts required to obtain three measurements increased with age (P < 0.001), and there was a trend toward an increase in the proportion of patients with less than three measurements after six attempts, with increasing age. Conclusions: The Ocuton S self-tonometer is an instrument that is easily taught to most patients in the clinical setting. Handling and reliability decreases with age. The Ocuton S self-tonometer may be clinically useful as a means of phasing patients with presumed normal-tension glaucoma or primary open-angle glaucoma with field progression, despite acceptable IOP when measured in clinic, but further evaluation in the ambulatory setting is required.

    Original languageEnglish
    Pages (from-to)17-22
    Number of pages6
    JournalClinical and Experimental Ophthalmology
    Issue numberPROC.
    Publication statusPublished - 2003


    • Intraocular pressure
    • Ocuton S
    • Phasing
    • Self-tonometer
    • Tonometry


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