Journal of Korean Ophthalmic Optics Society (한국안광학회지)

The Korean Ophthalmic Optics Society (한국안광학회)
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Comparative Study of Korean Letters Legibility of Progressive Lens Wearers and Single Focus Lens Wearers under the VDT Circumstance

VDT 환경에서 누진렌즈와 단초점렌즈 착용자의 한글 읽기능력 비교 연구

  • Ku, Hye Yeon (Dept. of Optometry, Seoul National University of Science and Technology) ;
  • Kim, Dal-Young (Dept. of Optometry, Seoul National University of Science and Technology)
  • 구혜연 (서울과학기술대학교 안경광학과) ;
  • 김달영 (서울과학기술대학교 안경광학과)
  • Received : 2012.01.31
  • Accepted : 2012.06.16
  • Published : 2012.06.30
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Abstract

Purpose: We intended to study effects of wearing the progressive lenses on legibility of Korean letters under the VDT circumstance. Methods: Fifty subjects wearing the progressive lenses and the single focus lenses were asked to find designated characters on web-pages under the VDT circumstance. We measured times for subjects to read the web-pages and numbers of missed characters, considering them as standards of legibility, and compare results of the progressive lenses with those of the single focus lenses by variables of the size and legibility of letters and the width of web-pages. Results: In case of the progressive lenses, all the times to read the web-pages and some of the numbers of missed characters increased with statistical significance. Smaller the character size, lower the legibility of character itself, and wider the width of web-page, the legibility tended to be seriously lowered by the progressive lenses. Conclusions: It is presumed that the intermediate part of progressive lenses with narrow visual field lowers the legibility of Korean letters under the VDT circumstance.

목적: 누진렌즈의 착용이 VDT 환경에서 한글의 가독성에 미치는 영향을 연구하고자 하였다. 방법: VDT 환경에서 50명의 피검자를 대상으로 누진렌즈와 단초점렌즈를 착용시키고 웹문서를 읽으면서 지정된 글자를 찾도록 하였다. 피검자들이 웹문서를 읽는데 걸리는 시간과 지정된 글자를 찾지 못하고 누락시킨 숫자를 측정하여 가독성의 기준으로 삼았으며, 누진렌즈를 착용했을 때와 단초점렌즈를 착용했을 때의 측정 결과를, 글자 크기와 가독성, 그리고 웹문서의 너비를 변수로 하여 비교하였다. 결과: 누진렌즈를 착용하였을 때 웹문서를 읽는 시간이 통계적 유의성을 가지고 증가하였으며 찾지 못하고 놓친 숫자의 증가 또한 일부의 경우 통계적 유의성을 보였다. 글자의 크기가 작을수록, 글자 자체의 가독성이 낮을수록, 웹문서의 가로 너비가 넓을수록 누진렌즈에 의한 가독성의 저하가 심해지는 대체적인 경향성이 나타났다. 결론: 시야가 좁은 누진렌즈의 중간부는 VDT 환경에서 한글의 가독성을 저하시키는 단점을 갖는 것으로 추정된다.

Keywords

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