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The effect of contact lens induced oedema on the accuracy of Goldmann tonometry in a mature population

Hamilton-Maxwell, Kirsten E., Pye, D. P., Hua, S., Yu, F., Chung, J. and Hou, Q. 2007. The effect of contact lens induced oedema on the accuracy of Goldmann tonometry in a mature population. British Journal of Ophthalmology 91 (12) , pp. 1636-1638. 10.1136/bjo.2007.118695

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Abstract

Aims To determine the effect of contact lens-induced oedema on the accuracy of Goldmann tonometry measurements of intraocular pressure (IOP) in mature subjects. Methods 22 healthy subjects aged between 50 and 60y were recruited for this study. Corneal curvature, IOP, and central corneal thickness (CCT) were measured before and after 2h of monocular closed-eye wear of a thick hydroxyethyl methacrylate (HEMA) contact lens. Measurements were then repeated at 20min intervals for 1h after lens removal. Results CCT (+54.1μm) and IOP (+2.7mmHg, p<0.001, paired t-test with Bonferroni correction) increased significantly after lens wear. For the hour following lens removal, the measured IOP was correlated to the increase in CCT (r=0.84, p<0.001), at a rate of 1.0mmHg/10μm (95% CI 0.8-1.2mmHg/10μm, linear mixed model analysis). Conclusion A relatively small increase in CCT due to contact lens-induced corneal oedema caused an overestimation error in Goldmann tonometry measurements of IOP in healthy mature subjects.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Optometry and Vision Sciences
Subjects: R Medicine > RE Ophthalmology
Uncontrolled Keywords: Corneal thickness, tonometry, oedema, aging
Publisher: BMJ Publishing Group
ISSN: 0007-1161
Last Modified: 04 Jun 2017 04:16
URI: http://orca.cf.ac.uk/id/eprint/35709

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