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KMID : 1159320140160020228
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Korean Journal of Vision Science
2014 Volume.16 No. 2 p.228 ~ p.234
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Deposits on the Worn Silicone Hydrogel Contact Lens and the Variation of the Optical Transmittances
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Shin Hyung-Sup
Park In-Jee
Jang Jun-Kyu
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Abstract
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Purpose: The purpose of this study was to observe the surface deposits on the worn silicone hydrogel lens by X-ray photoelectron spectroscopy(XPS) and to understand relation to the optical transmittances.
Methods: After wearing plasma treated Lotrafilcon A silicone hydrogel lens, the components of the surface deposits and chemical bonds were analyzed by XPS, and measured the optical transmittance in accordance with the surface deposits.
Results: At the beginning, mucin deposit occurred mainly and it occupied 40% of the deposits but there was no big increment in mucin deposit afterwards. The amount of the lipid deposit was smaller than mucin but it continued to increase up to 20%. 3.4% of the optical transmittance of the visible ray decreased by the first 5 days, and after that additional decrease of the optical transmittance was 1.2%.
Conclusions: The deposits of hydrophilic surface of silicone hydrogel lens treated by plasma were mainly mucin and the lipid is deposited on the mucin deposit and slowly increased. The deposits reduce the optical transmittance, but the influence on the optical transmittance has decreased.
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KEYWORD
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Silicone Hydrogel Contact Lens, XPS, Optical Transmittance
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