The hottest CIE releases the latest technical repo

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CIE released the latest technical report to analyze the impact of environment on visual function recently, CIE released a new technical report, lighting for older people and people with visual impact in buildings (cie-227), which analyzed the impact of lighting environment on visual functions (such as visual sensitivity, contrast sensitivity, visual field and color vision) Some lighting design methods for the elderly and low vision people are given in public places and indoor environments such as houses for the elderly and low vision people

when the age is over 45 years old, the light scattering in the eye gradually increases, the spatial contrast sensitivity and the illumination of the visual film gradually weaken, the dark adaptation decreases, the color vision becomes weak, and the human vision gradually weakens. According to the statistics of the World Health Organization (who), in 2017, the vision of more than 285million people in the world was damaged at the landing ceremony of the mass entrepreneurship and innovation complex. With the increasing problem of global population aging (as shown in Figure 1), the social labor force is also gradually aging. The lighting design for the elderly and low vision people can not be ignored

Figure 1 percentage of aging population (over 65 years old now) and estimated aging population in the future in each country

in previous reports, cie123-1997 described the impact of lighting environment on visual functions (such as visual sensitivity, contrast sensitivity, visual field and color vision), and put forward some lighting design suggestions for low vision people; ANSI/ies rp-28-07 puts forward the overall lighting design scheme for the elderly in specific application places such as elevators, corridors, bedrooms and bathrooms; CIE 196:2011 analyzed the contrast sensitivity (CSF) calculation model of different age groups, providing lighting designers and engineers with design schemes for the elderly and people with visual impairment

on the basis of existing research and in combination with the current social situation, this technical report has made the following improvements and improvements without worrying about not being able to buy tickets:

① reduce the age limit of the elderly from 65 to 50, and increase the lighting design requirements for the elderly and low vision people in public places such as offices

② the effects of illumination level, brightness contrast, disability and discomfort glare on visual functions such as contrast sensitivity and glare sensitivity of the eyes are systematically analyzed, and corresponding design suggestions for the elderly and low vision people are given

③ the design methods of lighting and color in different places are analyzed more specifically in the form of examples

according to the analysis of this technical report, with the increase of age, although the sensitivity of human eyes to the brightness contrast between the light source and the background decreases, the increase of intraocular light scattering will directly increase the imaging size of the light source on the visual film. According to the unified glare index UGR model, the larger the size of the light source, the higher the level of discomfort glare. Therefore, the older the age is, the greater the interconnection is. Some information is high in HTML format, The visual effects of disability glare and discomfort glare are more obvious. As shown in Figure 2, the glare degree of the same light curtain brightness in the eyes of the elderly is significantly higher than that of the young

Figure 2 the brightness of the same light curtain emitted by the computer in the eyes of young people (left) and old people (right)

in addition to visual function, human eyes also have non visual function. Non visual effects have an important impact on the circadian rhythm system of the human body. The light level, spectrum, light distribution, frequency and duration of light source will affect people's mood and sleep quality. Therefore, in order to better protect the vision and physical health of the elderly and low vision people, the impact of lighting on human visual and non visual effects should be comprehensively considered when designing environmental lighting

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