한국안광학회지 (Journal of Korean Ophthalmic Optics Society)

한국안광학회 (The Korean Ophthalmic Optics Society)
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시력 단계별 시표 식별 최소조도 및 대비도와 조도에 따른 시표 식별능력의 차이

Minimal Illumination to Identify the Chart in Each Visual Acuity and Deviation of Identification Capability According to Illumination and Chart Contrast

  • 김상엽 (강원대학교 안경광학과) ;
  • 조현국 (강원대학교 안경광학과)
  • 투고 : 2013.11.01
  • 심사 : 2013.12.14
  • 발행 : 2013.12.31
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초록

목적: 소수시력 단계별 시표 식별 최소조도와 대비도와 조도에 따른 개인별 시표 식별능력 차이를 알아보고자 하였다. 방법: 소수시력 단계별 10단계의 대비도로 구분되는 검사거리 3 m용 란돌트시표를 제작하였다. 69안을 대상으로 대비도 100% 시표를 사용하여 시력 단계별 식별 최소조도를 측정하였다. 시력단계별 식별 최소조도와 230 lx 상태에서 각각 식별할 수 있는 최저 시표 대비도를 측정하였다. 결과: 소수시력 단계별로 대비도 100% 시표를 식별하는 최소조도는 시표크기가 작아질수록 더 높게 측정되었다. 시력 1.0을 식별하는 평균 조도는 $74.39{\pm}25.90$ lx, 69안의 측정 범위는 17~107 lx 였다. 최소조도 상태와 230 lx 상태에서 식별가능한 최저 시표 대비도를 측정한 결과, 두 조건 모두에서 시표의 크기가 작아질수록 최저 대비도는 높아졌으며, 69안 간의 식별 최저 시표 대비도 차이도 증가되었다. 결론: 굴절교정을 위한 검사에서 조명조건이나 대비도에 따른 개인별 시표 식별능력 차이를 고려해 볼 필요가 있다.

Purpose: To determine the minimal illumination for visual acuity with the decimal vision chart and individual difference with varying contrast and illumination. Methods: Landolt's vision chart with 10 different grade of contrast was made. Minimal illumination was measured for 69 eyes using 100% contrast vision chart. Minimal contrast for identifying the chart was measured in conditions of the minimal illumination and 230 lx, respectively. Results: Minimal illumination was gradually increased with decrease of the chart size. Mean of minimal illumination to identify the 1.0 visual acuity was $74.39{\pm}25.90$ lx with range of 17~107 lx. In conditions of the minimal illumination and 230 lx, the minimal contrast for identifying the chart were gradually increased with decrease of the chart size in both conditions, the those deviation for 69 eyes was also increased. Conclusions: For refractive correction, examiners need to consider the individual difference for identifying the visual chart according to illumination and contrast.

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참고문헌

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피인용 문헌

  1. Individual Difference in the Decrease of Visual Acuity and the Change in Contrast Threshold According to the Level of Optically Induced Retinal Defocus vol.19, pp.1, 2014, https://doi.org/10.14479/jkoos.2014.19.1.93
  2. Changes of Refractive Errors Caused by Corneal Shape and Pupil Size vol.19, pp.3, 2014, https://doi.org/10.14479/jkoos.2014.19.3.383
  3. Effects of Variation of Illumination on Visual Function Factors vol.20, pp.2, 2015, https://doi.org/10.14479/jkoos.2015.20.2.195