In this study we investigated the lighting environment in train stations in the Metropolitan area after electricity saving measures have been implemented in the aftermath of the Great East Japan Earthquake. We found that even though Level A stations have higher recommended values for maintained illuminance in station concourses, illuminance of Level A and Level B stations had similar cumulative frequencies. During the interim period after electricity use restrictions were lifted, lighting rate was higher than during the summer period when the restrictions were being imposed, approaching nearly pre-earthquake conditions. In the future, the challenge is to propose methods for reducing lighting without reducing the quality of the lighting environment on the basis of the results of this study.
After the Great East Japan Earthquake in March 11, many power stations shut down, resulting in heightened awareness towards energy conservation due to power shortages. Even lighting, which is essential for children with amblyopia, has become subject to energy conservation measures, adversely affecting amblyopic children's daily activities. In this paper, we will report on the situation of amblyopic children enrolled in the Elementary Department of the Special Needs Education School for the Visually Impaired, University of Tsukuba.
In this article, I wrote about our family's experiences in the face of the massively unprecedented disaster, about our actions and our life in evacuation shelters. I also mention what I think should be done in preparing and securing lighting needs in different situations as well as my thoughts on how to personally help friends in tsunami-hit areas and my actual experiences in giving relief. I know that we have lost so much in this disaster. but if we can learn something from it as those who have lived through it, we can turn it into a truly meaningful experience.
Visual function of low-vision individuals is influenced by the illuminance of the viewing environment and the luminance of the object being viewed. In this paper, we will give an overview of contrast sensitivity and color similarities and the effects of luminance and illuminance on visual function. Low-vision individuals, who have reduced visual functions compared to sighted persons, have even lower sensitivity to contrast and ability to distinguish colors under mesopic light conditions. Majority of test subjects surveyed reported experiencing glare during the day in their daily activities. Thus, lighting considerations for low-vision individuals should not only include darkness but also glare.
We calculated equivalent illuminance levels and their ratios for young and elderly people by combining data on age-related changes of human crystalline lens and pupil size. The results reveal that effective illuminance for the elderly is a quarter of that for young people when, for energy savings, environmental illuminance is reduced to half. In addition, visibility of the elderly is lower than that of the young even though equivalent illuminance is ensured for the elderly. Finally, we showed that some considerations, such as more than doubling the illuminance of the young, may be necessary for the elderly when energy savings are conducted in public spaces.