Discomfort glare is task dependent
by M. Sivak, M. Flannagan, M. Ensing, C.J. Simmons
International Journal of Vehicle Design (IJVD), Vol. 12, No. 2, 1991

Abstract: This study evaluated the effect of task difficulty on discomfort glare. Subjects performed two tasks on each trial. The first was a gap detection task, in which the subject indicated whether the gap had appeared on the top or bottom edge of the outline of a briefly projected square. The difficulty of this task was manipulated by changing the size of the gap in the square. The second 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 (1) an increase in the difficulty of the gap-detection task resulted in an increase in discomfort glare, and (2) subjects with poorer overall gap detection performance tended to assign more discomfort to the glare stimuli than subjects with better gap-detection performance. These results are consistent with the hypothesis that discomfort glare is related to task difficulty. Consequently, a valid evaluation of discomfort glare in a given situation requires the presence of the relevant visual task. One interpretation is that task difficulty influences discomfort glare by modifying an observer's perceived level of visual impairment.

Online publication date: Tue, 27-May-2014

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