Original Research

Refractive behavior changes with six months daily wear of high and low oxygen permeability hydrogel contact lenses

W.D.H. Gillan
African Vision and Eye Health | South African Optometrist: Vol 65, No 2 | a260 | DOI: https://doi.org/10.4102/aveh.v65i2.260 | © 2006 W.D.H. Gillan | This work is licensed under CC Attribution 4.0
Submitted: 19 December 2006 | Published: 19 December 2006

About the author(s)

W.D.H. Gillan, Optometric Science Research Group, Department of Optometry, University of Johannesburg, PO Box 524, Auckland Park, 2006, South Africa

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Abstract

Introduction: The investigation of myopia and soft contact lenses is not new. Many reports show  that  the  wearing  of  silicone  hydrogel lenses as opposed to conventional disposable hydrogel lenses results in little progression of myopia in the eyes wearing silicone hydrogels. Method: Six subjects wore a silicone hydro-gel lens on one eye while the other eye wore a habitual disposable hydrogel lens for six months of daily wear. Fifty measurements of refractive state in each eye were taken prior to the subjects wearing a silicone lens in one eye and a conven-tional hydrogel lens in the other eye. After six months of daily wear another fifty measurements of refractive state were taken for each subject. Results:  Although  there  is  no  statisti-cal  support  for  the  findings  of  this  study, comet stereo-pairs are used to show the chang-es in refractive state for each subject. Four of  the  six  subjects  showed  an  increase  in myopia in the eye wearing the silicone lens. Discussion:  The  increase  in  myopia in eyes wearing a silicone hydrogel lens is contrary  to  the  findings  of  other  studies.

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