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タイトル: The Concept of Visual Acuity Ratio to the Maximum Level of Individual Visual Acuity : The Evaluation Method of Background Luminance and Visual Distance on Visibility Taking into Account of Individual Visual Acuity
著者: AKIZUKI, Yuki; INOUE, Youko
著者(別表記) : 秋月, 有紀; 井上, 容子
著者読み: あきづき, ゆうき; いのうえ, ようこ
キーワード: visual acuity; luminance; visual distance; visual acuity ratio; age; individual differences
発行日: 2004年 4月
出版者: The Illuminating Engineering Institute of Japan (IEIJ)
引用: AKIZUKI Yuki, INOUE Youko:Journal of Light & Visual Environment Vol. 28, No.1, pp.35-49
抄録: 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 visibilities. 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 eye chart (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 visibilities. The concept of VAR is applicable to past studies.
記述: この論文の著作権は照明学会が有する。
URI: http://hdl.handle.net/10935/4381
ISSN: 0387-8805
出現コレクション:雑誌

このアイテムの引用には次の識別子を使用してください: http://hdl.handle.net/10935/4381

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