The measurement of intraocular pressure over positive soft contact lenses by rebound tonometry [Medición de la presión intraocular sobre lentes de contacto blandas positivas, mediante tonometría de rebote]

Zeri, Fabrizio, De Cusatis, Mario, lupelli, luigi, & Swann, Peter G. (2016) The measurement of intraocular pressure over positive soft contact lenses by rebound tonometry [Medición de la presión intraocular sobre lentes de contacto blandas positivas, mediante tonometría de rebote]. Journal of Optometry, 9(3), pp. 182-188.

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Abstract

Purpose

  • To investigate if the accuracy of intraocular pressure (IOP) measurements using rebound tonometry over disposable hydrogel (etafilcon A) contact lenses (CL) is affected by the positive power of the CLs.

Methods

  • The experimental group comprised 26 subjects, (8 male, 18 female). IOP measurements were undertaken on the subjects’ right eyes in random order using a Rebound Tonometer (ICare). The CLs had powers of +2.00D and +6.00D. Measurements were taken over each contact lens and also before and after the CLs had been worn.

Results

  • The IOP measure obtained with both CLs was significantly lower compared to the value without CLs (t test; p<0.001) but no significant difference was found between the two powers of CLs.

Conclusions

  • Rebound tonometry over positive hydrogel CLs leads to a certain degree of IOP underestimation. This result didn’t change for the two positive lenses used in the experiment, despite their large difference in power and therefore in lens thickness. Optometrists should bear this in mind when measuring IOP with the rebound tonometer over plus power contact lenses.

Impact and interest:

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ID Code: 89623
Item Type: Journal Article
Refereed: Yes
Keywords: Contact lens, Hydrogel, Rebound tonometry, Intraocular pressure
DOI: 10.1016/j.optom.2015.09.001
ISSN: 1888-4296
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: Copyright 2015 Published by Elsevier España, S.L.U. on behalf of Spanish General Council of Optometry.
Deposited On: 28 Oct 2015 23:07
Last Modified: 09 Jul 2016 01:26

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