Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/14459
Title: Dynamic contour tonometry over silicone hydrogel contact lens
Authors: Lam, AKC 
Tse, JSH
Keywords: Corneal hysteresis
Corneal resistance factor
Intraocular pressure
Lens modulus
Ocular pulse amplitude
Issue Date: 2014
Publisher: Spanish Council of Optometry
Source: Journal of optometry, 2014, v. 7, no. 2, p. 91-99 How to cite?
Journal: Journal of Optometry 
Abstract: Purpose This study compared the measurements of intraocular pressure (IOP) and ocular pulse amplitude (OPA) using the Dynamic Contour Tonometry (DCT) over silicone hydrogel contact lenses of different modulus. Corneal biomechanics were also measured using the Ocular Response Analyzer (ORA). Methods Forty-seven young (mean age 22.3 years, standard deviation 1.2 years) subjects had IOP, OPA, corneal hysteresis (CH) and corneal resistance factor (CRF) measured without lens and with two brands of silicone hydrogel contact lenses. Each eye wore one brand followed by another, randomly assigned, and then the lenses switched over. Difference and agreement of IOP and OPA with and without silicone hydrogel contact lens were studied. Results The right and left eyes had similar corneal curvatures, central corneal thicknesses, IOP, OPA and corneal biomechanics at baseline. No significant difference was found in CH and CRF when they were measured over different contact lenses. IOP demonstrated a greater difference (95% limits of agreement: 2.73 mmHg) compared with no lens when it was measured over high modulus silicone hydrogel lenses. Agreement improved over low lens modulus silicone hydrogel lenses (95% limits of agreement: 2.2-2.4 mmHg). 95% limits of agreement were within 1.0 mmHg for OPA. Conclusions This study demonstrated the feasibility of DCT over silicone hydrogel lenses. Low lens modulus silicone hydrogel contact lens in situ has no clinical effect on DCT.
URI: http://hdl.handle.net/10397/14459
ISSN: 1989-1342
DOI: 10.1016/j.optom.2013.07.005
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