The laboratory study evaluated the effect of task difficulty on discomfort glare. Two tasks were performed on each trial. The first was a gap-detection task, in which the subject indicated whether the gap had appeared on the top or the bottom edge of the outline of a briefly projected square. The difficulty of the task was manipulated by changing the size of the gap in the square. The second task was a discomfort-glare rating, in which the subject gave a numerical rating of the discomfort experienced from a glare source that was presented simultaneously with the gap-detection stimulus. The hypothesis was that the resulting changes in the difficulty of the gap-detection task would influence discomfort glare. The results indicate that as expected, discomfort glare was strongly influenced by glare illuminance, an increase in the difficulty of the gap-detection task resulted in an increase in discomfort glare, and the subjects with poorer overall gap-detection performance tended to assign more discomfort to the glare stimuli than subjects with better overall gap-detection performance. One possible interpretation of these findings is that task difficulty influences discomfort glare by modifying an observer's perceived level of visual impairement (perceived disability glare).
Discomfort Glare is Task Dependent
1989
19 pages
Report
Keine Angabe
Englisch
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