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Effect of lotrafilcon A silicone hydrogel contact lens on intraocular pressure measurement

Carlos García-Resúa, Silvia García-Montero, Hugo Pena-Verdeal, Jorge Gilino, Eva Yebra-Pimentel, Maria J. Giráldez
  • Carlos García-Resúa
    Department of Applied Physics - Optometry Group, University of Santiago de Compostela, Spain
  • Silvia García-Montero
    Department of Applied Physics - Optometry Group, University of Santiago de Compostela, Spain
  • Hugo Pena-Verdeal
    Department of Applied Physics - Optometry Group, University of Santiago de Compostela, Spain
  • Jorge Gilino
    Department of Applied Physics - Optometry Group, University of Santiago de Compostela, Spain
  • Eva Yebra-Pimentel
    Department of Applied Physics - Optometry Group, University of Santiago de Compostela, Spain
  • Maria J. Giráldez
    Department of Applied Physics - Optometry Group, University of Santiago de Compostela, Spain | mg.giraldez.mj@gmail.com

Abstract

The present paper aims to assess the effect of lotrafilcon A contact lenses (CL) in situ on intraocular pressure (IOP) measurement performed with three portable tonometers (ICare, Tonopen and Perkins). This cross-sectional study included thirty young healthy subjects. Intraocular pressure measurements without CL were performed first, followed by IOP measurements with CL for twenty minutes. ICare IOP measurements obtained with lotrafilcon A CL overestimated IOP values without CL by 1 mmHg (P<0.001). However, both techniques displayed close level of agreement (95% LoA, -4.17 to +1.63 mmHg). Also, differences between both methods tended not to increase (P=0.9). No significant differences were observed between IOP measurements without and with CL for Perkins (paired-t test, P=0.23) and Tonopen XL (pairedt test, P=0.17). In conclusion, adequate IOP measurements through zero power lotrafilcon A silicone hydrogel CL can be obtained with all three tonometers in healthy eyes, although, in case of ICare, the practitioner must be aware of the 1 mmHg overestimation with CL.

Keywords

intraocular pressure, silicone hydrogel contact lens, elasticity, portable tonometer, ICare

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Submitted: 2013-07-29 14:46:50
Published: 2014-07-28 13:04:17
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Copyright (c) 2014 Carlos García-Resúa, Silvia García-Montero, Hugo Pena-Verdeal, Jorge Gilino, Eva Yebra-Pimentel, Maria J. Giráldez

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