個人の最大視力に対する視力比の概念の導入 : 個人の視力に配慮した視認能力評価における背景輝度と視距離の影響の取り扱いについて

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We use the maximum level of individual visual acuity (MVA) as an index for the individual visual ability. Also, we define the concept of the ratio of visual acuity under various environmental conditions for the MVA as Visual Acuity Ratio (VAR), in order to describe differences between individual visibility. An experiment was carried out using various levels of background luminance and visual distance. The visual acuity of subjects in two age groups (Young and Aged) was measured by using Landolt's eyechart (luminance contrast 0.93) .The Aged subjects' vision was corrected by two kinds of spectacles: ones for myopia/presbyopia. Under conditions providing sufficient visual acuity, the subjects' order of individual visual acuity was unchanged. Therefore, MVA can be used as an index for the visual ability of the individual. Regardless of corrected conditions, the individual visual acuity reaches the maximum level under 800cd/m^2 and the corrected position. The results of the eyesight test can be used as a substitution for MVA. Visual acuity is changing under environmental conditions, and a degree of the changes varies with age, corrected conditions, and differences in visual acuity. Under the corrected position, the relationship between background luminance and VAR is constant regardless of age group, corrected conditions and differences of visual acuity. The relationship between visual distance and VAR differs by age and corrected conditions. However, in the neighborhood of the corrected position, the relationship between visual distance and VAR is constant regardless of differences between individual visibility. The concept of VAR is applicable to past studies.
社団法人照明学会の論文
2002-11-01

個人の最大視力に対する視力比の概念の導入 : 個人の視力に配慮した視認能力評価における背景輝度と視距離の影響の取り扱いについて

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