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KMID : 1011420150200020125
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Journal of Korean Ophthalmic Optics Society
2015 Volume.20 No. 2 p.125 ~ p.131
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The Effect of Circle Contact Lens on the Stability of Tear Film
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이세희:Lee Se-Hee
형성민:Hyung Sung-Min/고승환:Koh Seung-Hwan/박미정:Park Mi-Jung/김소라:Kim So-Ra
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Abstract
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Purpose: The effect of pigmentation in circle contact lens on lens wearers’ tear film stability was investigated in this study.
Methods: Non-invasive tear film break-up times of 54 normal eyes before and after lens wearing in twenties and the portion of first tear breakup were measured. The frontal and back surface roughness of circle contact lens was further observed with a scanning electron microscope. The clear lens which was made of hilafilcon B and circle contact lenses which were made of hilafilcon B, polymacon and copolymer of HEMA· NVP were tested.
Results: Non-invasive tear film breakup time was significantly reduced compared with it before lens wearing. In some case, statistically significant difference in tear film breakup time was also observed between circle contact lenses. The tear file break-up was usually early started in lower than upper portion, and in temporal than nasal portion although there was variation in the lens material. The tear film break-up of circle contact lenses made of hilafilcon B was more commonly observed in peripheral portion(pigmented area) compared with clear contact lens made of same material.
Conclusions: The present study revealed that the stability of tear film was affected by wearing circle contact lens and the result seems to be used as the basis for the problem solving that can occur due to the pigmentation when wearing circle contact lens.
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KEYWORD
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Circle contact lens, Non-invasive tear film break-up time, Tear film break-up, Surface roughness
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