著者

落合 太郎

出版者

一般社団法人照明学会

雑誌

照明学会誌 (ISSN:00192341)

巻号頁・発行日

vol.94, no.3, pp.192-197, 2010-03-01

参考文献数

2

被引用文献数

2

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To colour-deficient drivers, red and yellow traffic signals are indistinguishable. The solution is to mark an "X" on red signals that can be seen at 100m only by colour deficient drivers, while drivers with normal vision cannot see it. This elegant design exhibits the inverse "Ishihara's Test" concept; an ironic phenomenon in which the colour blind show relatively higher luminous efficiency in the shorter range (i.e., blue) than in the longer range (i.e., red) of wavelengths, which means that the similarly observed colour combination of red and red purple will be observed as if strongly contrasted "opaque and dull brown" and "clear blue." Then, the experiment found a specific "X" pictograph that all colour blind persons could observe but that none of the people with normal vision could see from 100m.