Original Research

Effects of short-term wear of silicone hydrogel contact lenses on refractive behaviour

W. D. H. Gillan
African Vision and Eye Health | South African Optometrist: Vol 71, No 2 | a69 | DOI: https://doi.org/10.4102/aveh.v71i2.69 | © 2012 W. D. H. Gillan | This work is licensed under CC Attribution 4.0
Submitted: 09 December 2012 | Published: 09 December 2012

About the author(s)

W. D. H. Gillan, Department of Optometry, University of Johannesburg, South Africa

Full Text:



Contact lens wear is known to induce change in both the cornea and refractive state. Often a shift towards increased myopia is noted. Historically investigations into the effects of contact lenses onrefractive state have often been incomplete in terms of statistical analysis whereby nearest equivalent sphere is used or the spherical, cylindrical and axis components are analyzed in isolation. The aim ofthis study was to investigate the short-term effects of silicone hydrogel contact lenses on refractive behaviour. Seven volunteers agreed to wear a silicone hydrogel lens on one eye for a period of thirty minutes. Prior to lens wear, after ten minutes of lens wear and after thirty minutes of lens wear 50 autorefractor measurements were taken of refractive state from each subject. Data were analyzed using multivariate statistical methods. Scatter plots and other multivariate statistics are used to show how lens wear influences refractive behaviour. The results of this study show that silicone hydrogel contact lenses do influence refractive behaviour in both a spherical as well as an antistigmatic (astigmatism) fashion. (S Afr Optom 2012 71(2) 78-85)



silicone hydrogel contact lenses; contact lenses; refractive behavior; autorefraction


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