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KMID : 1159320070090040401
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Korean Journal of Vision Science
2007 Volume.9 No. 4 p.401 ~ p.412
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Research on the Actual State of Domestic Trial Lens
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Park Sang-Yeol
Moon Byeong-Yeon
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Abstract
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In light of inadequate Korean standards and quality management for trial case lenses used in subjective refraction or checking the final power of glasses or lenses, so this study aims at introducing proper standards of trial case lenses through gathering those used in the market, estimating their optical quality and comparing them with the imported trial case lenses.
For this purpose, the study conducted a questionnaire survey of optometrists using trial case lenses in their shops, and after selecting optician’s shops which were using domestic and imported trial case lenses and according to their using period of the lenses, 5 shops each with lenses younger than 5 years, 5-10 years and with older than 10 years, and their lenses were selected and collected, and then we made a comparative analysis with the International Standard(ISO 9801) by measuring the marked refractive power of the lenses and their actual one.
As a result of the survey, more than 80% of respondents answered that they trust the optical quality of their trial case lenses, moreover they have never checked the consistency between the marked power and the actual power since they had bought them. Also, it was found that 95% of respondents felt inconvenient in refraction and need of supplement to some lenses not included in the trial case lenses in use.
As a result of the measurement, the number of trial case lenses exceed the tolerance on power in ISO were 130 lenses(30.8%) of minus spherical power lenses, 84 lenses(21.5%) of plus spherical power lenses, 46 lenses(30.7%) of minus cylindrical power lenses and 12 lenses(8.0%) of plus spherical power lenses, respectively.
Therefore in order to improve Korean people’s ocular health and help them to maintenance their visual functions properly by accurate subjective refraction through enhancing the quality of both domestic and imported trial lenses in the market, it is thought that one should improve Korean Industrial Standards(KS P4402) matching international standards as soon as possible.
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KEYWORD
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Trial case lenses, Optical quality, Korean Industrial Standards(KS), International Standard(ISO), Dioptric power, Tolerance
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