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Title: The measurement of intraocular pressure over positive soft contact lenses by rebound tonometry
Authors: Zeri, F
De, Cusatis M
Lupelli, L
Swann, PG 
Issue Date: 2016
Source: Journal of optometry, 2016, v. 9, no. 3, p. 182-188
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 +2.00 D and +6.00 D. 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 testMergeCell 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 did not 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.
Keywords: Contact lens
Intraocular pressure
Rebound tonometry
Publisher: Elsevier Doyma
Journal: Journal of optometry 
ISSN: 1888-4296
DOI: 10.1016/j.optom.2015.09.001
Rights: © 2016 Spanish General Council of Optometry. Published by Elsevier España, S.L.U.
This is an open access article under the CC BY-NC-ND license (
The following publication Zeri, F., De Cusatis, M., Lupelli, L., & Swann, P. G. (2016). The measurement of intraocular pressure over positive soft contact lenses by rebound tonometry. Journal of optometry, 9(3), 182-188 is available at
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