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KMID : 0366519960160010137
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Annual Bulletin Seoul Health
1996 Volume.16 No. 1 p.137 ~ p.144
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The Overnight Corneal Swelling Induced by Extended Contact Lens Wear
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Mah Ki-Choong
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Abstract
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An overnight study was performed to measure the corneal swelling and deswelling induced by three soft contact lenses manufactured in Korea. All subjects were no lens wear or inexperienced to contact lens wear. The overnight corneal swelling of 5 subjects(l0 eyes) was measured with an optical pachometer. Corneal thichness measurements were taken just before eye closure and after nine hours of sleep. The overnight corneal swelling in control group was 2.34 %, and those in contact lens wearing groups were 8.49% for A lens, 12.34% for B lens, 11.19% for C lens, respectively, Overnight swelling for A lens was significantly less than that for the other lenses(p<0.05). Cornea] deswelling time to the level of a base line(pre-sleep) with no lens wear occurred within 1 hour in control group. Among the contact lens wearing groups, corneal deswelling occurred in 3 hours for A lens only, The average corneal swelling response for A and B lens was inversely proportional to the oxygen transmissibility(Dk/L) of the lenses. It was considered that the contact lenses in this study used were appropriate for daily wear mode, and careful evaluation should be need to prevent from adverse effects during extended wear.
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KEYWORD
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overnight corneal swelling, optical pachometer, extened contact lens wear, corneal thickness, Dk/L
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