The direct effect of light on the eye to produce bright feeling, it is a physical quantity to the illumination and brightness of the psychological side based, but in fact because of the eye of bright feeling has adaptive characteristics, will make a big change. That is, the eyes of the field of light and shade in the eye has a process of adaptation, because of the need to adjust the time, the feeling of light will not only have an impact, and sometimes even produce a sense of loss of security. Glare or extreme brightness distribution has a great influence on vision. It is also necessary to consider the adaptation phenomenon due to the distribution of light and shade in the visual field.
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