Dynamic Signs: Appropriate Contrast and Speed for Older Adults and Low Vision

2021 
The effects of contrast and speed of dynamic signs of visibility were experimentally examined. Thirty young adults, 30 older adults, and 20 persons with low vision participated in the experiment, wherein images of five different categories, namely lines, Japanese words, English words, simple figures, numbers, and pictograms were presented with varying speed and contrast. According to the results, an appropriate range of the speed and contrast of the dynamic signs was obtained considering older adults and persons with low vision. For persons with low vision, the results indicated an appropriate speed of 1.09 or less with a contrast of 0.89 or higher. In addition, it was found that the correct response rate of dynamic signs for young adults is high regardless of the visibility rating, whereas the correct response rate for persons with low vision is lower than that of young and older adults, even under conditions of “easy to see.” The results of this study will be applied to the descriptions of accessibility that are a part of a series of dynamic sign standards under development.
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