Abstract
An overnight study was performed to compare the corneal swelling and deswelling for two very different modes of extended wear. A soft disposable lens, Acuvue (Johnson & Johnson), and a high Dk RGP lens, Super EX (Menicon), were investigated. A contact lens-inexperienced group participated in this study. Each subject wore the soft lens on one eye and the RGP on the other. The control overnight swelling was 3.7%. Overnight swelling for the RGP lens was 6.5%, and for the soft lens, 10.0%. Corneal deswelling time to the level of a 10 a.m. baseline with no lens wear occurred within 2 hours for the control. Corneal deswelling time for the RGP lens occurred in 3 hours, and for the soft lens, between 7 and 9 hours. Corneal deswelling time to the level of the control condition showed the RGP lens condition to deswell within 4 hours. By this same analysis, the soft lens condition did not return to control levels even by the end of the study.
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