著者
笠井 幹治
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.64, no.11, pp.624-626, 1980-11-01 (Released:2011-07-19)
参考文献数
6
著者
小野 博之
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.86, no.4, pp.227-232, 2002-04-01 (Released:2011-07-19)
参考文献数
5
被引用文献数
1
著者
中山 和美 乾 正雄 佐藤 仁人 國友 美希
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.84, no.2, pp.100-106, 2000-02-01 (Released:2011-07-19)
参考文献数
3
被引用文献数
1 1

This study was conducted to clarify the difference in visual acuity and color recognition between the darker color eyes of Japanese and the fairer color eyes of Westerners at lower illuminance. A series of experiments were carried out in an experimental room in which the illuminance level could be changed. The parameters were the illuminance on a desk and the color of the subject's eyes. Ten illuminance levels, which increased geometrically from 0.001 to 30 lx, were used. The subjects comprised two groups having different eye colors. One group was made up of Japanese, who have dark eyes, and the other Europeans and North Americans with fair eyes. At each illuminance level, after 7 minutes for adaptation, each subject's visual acuity was tested using 4 types of color Landolt rings and color discrimination was tested using 12 different-color cards. The following results were obtained.(1) For a black Landolt ring on a white background, there was very little difference between the two groups' visual acuity.(2) For a green Landolt ring on a blue background, the visual acuity of the dark-eyes group was remarkably lower than that of the fair-eyes group.(3) In the color discrimination test, at an illumination of 1 lx or lower, the dark-eyes group confused colors more than the fair-eyes group.Accordingly, the differences in visual acuity and color discrimination between the two eye-color groups were only in color discrimination at lower illuminance.
著者
城内 忠志 田中 哲治 石崎 勝司
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.83, no.12, pp.922-925, 1999-12-01
被引用文献数
1
著者
小穴 純
出版者
一般社団法人 照明学会
雑誌
照明学会雑誌 (ISSN:00192341)
巻号頁・発行日
vol.33, no.6, pp.158-164, 1949-08-25 (Released:2011-07-19)
参考文献数
8
被引用文献数
1
著者
高桑 祐吉
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.71, no.3, pp.210-214, 1987-03-01 (Released:2011-07-19)
参考文献数
7
著者
栗木 一郎 石井 渉 内川 恵二
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.84, no.2, pp.107-116, 2000-02-01 (Released:2011-07-19)
参考文献数
13
被引用文献数
7 3

We conducted four kinds of psychophysical measurements on color vision to investigate whether the change in lens spectral transmittance that comes with aging is the primary factor in the change in color vision. We asked two observers (22 and 24 years old) to adapt to the scene while wearing goggles equipped with filters that simulate spectral transmittance at the retinal level of a person of 80 years old, when worn by 20 years old observer. During the test, which lasted as long as 12 hours, the observers performed (1) unique-white setting, (2) heterochromatic flicker photometry (HFP), (3) heterochromatic brightness matching (HBM), and (4) 100-hue test. The change in the results with and without the goggle showed that only difference in HFP sensitivity coincided exactly with the filter transmittance. A similar tendency was found in the difference between 20 and 80year-old observers in a previous study. The other tests matched with neither the difference in spectral transmittance nor the difference between 20-and 80year-old experimental results. Our results suggest that neural circuits, which may differ from those for illuminant change, play a significant role in correcting the relative spectrum change on the retina.
著者
兵頭 正明
出版者
照明学会
雑誌
照明学会雑誌 (ISSN:00192341)
巻号頁・発行日
vol.58, no.5, pp.229-231, 1974-05

5 0 0 0 OA 道路標識

著者
稲垣 襄二
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.71, no.7, pp.370-374, 1987-07-01 (Released:2011-07-19)
参考文献数
17
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

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.
著者
佐藤 千穂
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.82, no.8, pp.530-537, 1998-08-01 (Released:2011-07-19)
参考文献数
9
被引用文献数
5 2

It has been reported that color perception of bluish lights changes with age because of a considerable decrease of the sensitivity in short-wavelength region caused by the yellowing of the crystalline lens. However there is an opinion that the color perception of aged-people is compensated by chromatic adaptation since the yellowing of the crystalline lens gradually grows across the life-span.In order to clarify the change in color perception caused by aging, I conducted two experiments. First, the 100-hue test of the Japan Color Research Institute was performed to 70 observers aged from 20s to 70s. Second, an experiment of color naming to 16 color samples using Natural Color System was done to 200 observers aged from 10s to 50s.As a result of the 100-hue test, the age-related decline of color discrimination properties to the reddish-purple colors was admitted whereas color discrimination properties to the bluish colors did not dropped. On the other hand, the experiment of color naming showed that there was no age-related change of color perception.
著者
向阪 信一 山中 泰彦
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.76, no.7, pp.361-363, 1992-07-01 (Released:2011-07-19)
参考文献数
7