Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/16507
Title: The effect of hydrogel and silicone hydrogel contact lenses on the measurement of intraocular pressure with rebound tonometry
Authors: Zeri, F
Calcatelli, P
Donini, B
Lupelli, L
Zarrilli, L
Swann, PG
Keywords: Contact lens
Hydrogel
Rebound tonometry
Silicone hydrogel
Issue Date: 2011
Publisher: Elsevier
Source: Contact lens and anterior eye, 2011, v. 34, no. 6, p. 260-265 How to cite?
Journal: Contact lens and anterior eye 
Abstract: Purpose: To assess the accuracy of intraocular pressure (IOP) measurements using rebound tonometry over disposable hydrogel (etafilcon A) and silicone hydrogel (senofilcon A) contact lenses (CLs) of different powers. Methods: The experimental group comprised 36 subjects (19 male, 17 female). IOP measurements were undertaken on the subject's right eyes in random order using a rebound tonometer (ICare). The CLs had powers of +2.00D, -2.00D and -6.00D. Six measurements were taken over each contact lens and also before and after the CLs had been worn. Results: A good correlation was found between IOP measurements with and without CLs (all r≥ 0.80; p< 0.05). Bland Altman plots did not show any significant trend in the difference in IOP readings with and without CLs as a function of IOP value. A two-way ANOVA revealed a significant effect of material and power (p< 0.01) but no interaction. All the comparisons between the measurements without CLs and with hydrogel CLs were significant (p< 0.01). The comparisons with silicone hydrogel CLs were not significant. Conclusions: Rebound tonometry can be reliably performed over silicone hydrogel CLs. With hydrogel CLs, the measurements were lower than those without CLs. However, despite the fact that these differences were statistically significant, their clinical significance was minimal.
URI: http://hdl.handle.net/10397/16507
ISSN: 1367-0484
EISSN: 1476-5411
DOI: 10.1016/j.clae.2011.04.005
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