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KMID : 1011420170220030213
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Journal of Korean Ophthalmic Optics Society
2017 Volume.22 No. 3 p.213 ~ p.219
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Evaluation for Surficial and Internal Hydrophilicity of Soft Contact Lenses
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Park Hye-Lim
Shin Jang-Cheol
Kim So-Ra
Park Mi-Jung
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Abstract
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Purpose: The aim of this study was to investigate the difference between the surficial and internal hydrophilicity of soft contact lenses (hereinafter soft lenses) due to the presence or absence of wetting agents and dyes.
Methods: The surface and interior of 9 types of soft lenses available in the domestic market were stained with Sudan IV solution according to the modified Jacob method. The degree of hydrophilicity was determined by the converted concentration from the absorbance of Sudan IV extract obtained from the lenses according to the calibration curve.
Results: The hydrophilicity of the soft lenses was improved five times and more by the inclusion of wetting agent, and the improvement degree of the hydrophilicity was varied depending on the type of soft lenses. Depending on the presence or absence of dyes, the degree of hydrophilicity of the surface and interior of the soft lenses was changed, and the hydrophilicity of the surface and the interior was influenced by the location of dye.
Conclusions: From the present study, it was revealed that wetting agents and dyes affect the surface and internal hydrophilicity of soft lenses. Thus, the effect on hydrophilic properties may affect various material properties of soft lenses as well as comfortness.
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KEYWORD
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Soft contact lens, Surficial hydrophilicity, Internal hydrophilicity, Wetting agent, Tint
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