| Research Abstract |
For safe and comfortable visual environment plan, the evaluation method of visibility is established by considering the individual difference of visual property. The method constructed by this research is applicable even to the visual weak, such as the aged person, from the young person.
The main results are as follows.
1. The actual condition of visual acuity in the dairy life and the change of it by the environmental condition are clarified based on the data by 243 subjects. For the visual acuity, the individual difference by the age and the one in an age group is large. However, it is found that there is no individual difference at rate of change of visual acuity by background luminance.
2. The prediction method of visual acuity by using the visual acuity ratio and the maximum visual acuity is proposed.
3. The legibility depended on the relative relation between maximum visual acuity and character size.
4. The influence of task conditions (contrast, shape, arrangement, and character style), environmental conditions (background luminance, visual distance, observed direction), and observer conditions (age and visual acuity) to the legibility could be replaced by the influence of a character size.
5. The method of conversion to the equivalent character size in each condition is proposed. This made it possible to compare the legibility in each condition.
6. The physical factor which is related to visibility is measured for the display thing in our dairy life, and the situation in which various conditions of size, color, character array and so on intermingled is quantitatively grasped.
7. In order to evaluate the visibility of the display things and whole space where they have been installed, the technique is examined using the display thing, which existed actually. In addition, the treatment of the important factor except for the integration variable is examined.
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