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).


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    Title :

    Discomfort Glare is Task Dependent


    Contributors:
    M. Sivak (author) / M. Flannagan (author) / M. Ensing (author) / C. J. Simmons (author)

    Publication date :

    1989


    Size :

    19 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English




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