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KMID : 1159320130150020157
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Korean Journal of Vision Science
2013 Volume.15 No. 2 p.157 ~ p.164
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Effects of Atmosphere and Time on the RGP Contact Lens Surface Treated by Using a Plasma
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Shin Hyung-Sup
Jang Jun-Kyu
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Abstract
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Purpose: Commercial RGP contact lenses(Boston XO), composed of fluorosilicone acrylate, were treated by using a plasma in air. The chemical compositions and wettability of the surfaces were studied as a function of the atmosphere and the holding time. Methods: The lenses were kept in the atmosphere of a vacuum, air, water, etc. The chemical compositions and bond contents were estimated by the examination of X-ray photoelectron spectroscopy (XPS) spectra. The changes of wettability were analyzed from wetting angle measurement. Results: The oxygen-containing hydrophilic radicals (C-O, O-C=O and Si-O) on the surface increased greatly when the contact lens was treated by the plasma. The wetting angles decreased and then the surface wettability was improved. However according to increase the holding time, those hydrophilic radicals decreased, and the wetting angles increased. In the water atmosphere, the oxygen bonded with the carbon or silicon decreased significantly, and the wetting angles increased again. Conclusions: When the RGP lens treated by the plasma was contacted with moisture, the oxygen on the surface decreased rapidly and the surface wettability was reduced.
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KEYWORD
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RGP Contact Lens, Plasma, XPS, Wettability
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