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KMID : 1011420160210040341
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Journal of Korean Ophthalmic Optics Society
2016 Volume.21 No. 4 p.341 ~ p.350
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The Change of Circle Contact Lenses Exposed to Indoor Swimming Pool Water
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Kim So-Ra
Lee Kyeong-Eun
Lee So-Jin
Kwon Ji-Youn
Park Sang-Hee
Park Mi-Jung
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Abstract
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Purpose: Aims of this study was to investigate the usage pattern of contact lenses in indoor swimming pool and to analyze the change of refractive power, water content and pigmented surfaces of circle contact lenses when exposed to swimming pool water.
Methods: A questionnaire survey on the use of contact lenses in swimming pools was conducted for one hundred forty male and female (male 30, female 110) in their teen and twenties. Six types of circle contact lenses were exposed to swimming pool water for 2, 4, and 6 hours, respectively and then their refractive power and water content were measured. The change of pigmented surfaces was further observed by a scanning electron microscope.
Results: From the survey, it was revealed that 64.1% of contact lenses wearers had worn contact lenses in swimming pools and 53.8% of them had used circle contact lenses. Among the respondents, 71.4% had used swimming pools while wearing non-disposable contact lenses, 93.9% complained subjective symptoms, and 51.0% of them answered they had worn used contact lenses in swimming pools. There was a statistically significant change in refractive power of circle contact lenses when exposed to swimming pool water. However, it was confirmed that the change of refractive power according to exposure time was not significant since its change was within the allowable range of error of ±0.25 D provided by the manufacturer. Relatively large decrease in water content of circle contact lenses with a water content of more than 50% was shown when exposed to the swimming pool water. The roughness of tinted surfaces and the indistinction of brightness and peripheral tinted zone were observed when the circle contact lenses manufactured not by sandwich method were exposed to the swimming pool water.
Conclusions: Even though the tinted surfaces and water content were affected by exposure to swimming pool water, many contact lens wearers had used circle contact lenses in swimming pools. Therefore, wearing circle contact lenses in swimming pools should be controlled however, if be inevitable, wearing circle contact lenses with low water content manufactured by the sandwich method may reduce the problems.
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KEYWORD
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Circle soft contact lens, Swimming pool, Status usage of contact lenses, Water content, Refractive power, Tinted surface
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