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KMID : 1011420200250030235
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Journal of Korean Ophthalmic Optics Society
2020 Volume.25 No. 3 p.235 ~ p.248
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Analysis of Changing Pattern in Parameters and Surfac eof Soft Contact Lenses by Sweat
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Park Sung-Hyun
Park Jin-Sung
Kim So-Ra
Park Mi-Jung
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Abstract
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Purpose: In the present study, the change of subjective symptoms induced by sweating during exercise with soft contact lenses (hereinafter soft lenses) wear and the effects of sweating on lens parameters and surface were investigated.
Methods: Changes in subjective symptoms felt when soft lenses were exposed to sweat during exercise were surveyed among 139 adults between in their 10s and 30s. Four kinds of silicon hydrogel lenses with different surface treatment and three kinds of hydrogel lenses were selected as clear soft lenses, and three kinds of hydrogel lenses were selected as circle soft lenses, and were exposed to artificial sweat for one, two and three hours, respectively. The change was investigated by measuring lens parameters before and after exposure to artificial sweat, and dye elution and pigmentation pattern of circle lenses was confirmed by comparing the frontal surfaces through scanning electron microscopy before and after the artificial sweat exposure.
Results: According to the survey, subjective symptoms were found to get worse when the eyes and lenses were exposed to secreted sweat during exercise with soft lenses wear. Changes in parameters of soft lenses caused by artificial sweat appeared differently depending on material, ionicity, pigmentation, etc.; however, light transmissibility was least affected. Regardless of pigmentation, high water-ionic lenses had the most lens parameters that showed changes exceeding allowable Korean Food & Drug Administration (KFDA) criteria due to the sweat exposure. Although the change of parameters in silicon hydrogel lenses by artificial sweat was generally smaller than that of hydrogel lenses, changes exceeding allowable KFDA criteria were shown in the water content of delefilcon A lenses and in the refractive power of somofilcon A lenses. On the other hand, in the case of clear and circle lenses made of same material, there were lesser changes in base curve and total diameter of the clear lens, and in the refractive power, central thickness and water content of the circle lens. Changes in dye elution and pigmentation pattern of circle lenses appeared in lenses not manufactured by the sandwich method.
Conclusions: From the results, it is recommended to wear clear lenses made of un-pigmented silicon hydrogel material to minimize the increase of subjective symptoms, the resulting ocular side effects and change of lens parameters when soft lenses wear is necessary during intensive exercise producing sweat. Moreover, even clear lenses can be recommended to use silicon hydrogel lenses that do not have hydrophilic surface treatment.
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KEYWORD
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Soft Contact Lenses, Artificial sweat, Lens Parameters, Lens Material, Circle Contact Lenses
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