Recently the development of information equipment including computers has advanced rapidly. Accompanying it, the opportunity of using the man-machine interface using CRT display has increased. It is considered that in the case of the works that are carried out by reading the information displayed on a CRT, the easiness of observing the displayed information exerts large influence to the accuracy and efficiency of the works, fatigue and others. In the works accompanied by danger, its mistaken cognition may sometimes be linked with serious accidents. Accordingly, the easiness of its cognition is an important subject in view of safety.
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