Trait-Based Individual Differences on Discomfort Glare Rating Responses and Related Visual Contrast Sensitivity

The objective of the study was to investigate the relationship between Trait-based Individual differences (neuroticism and extraversion) on glare subjective responses and contrast sensitivity performance when exposed to same manipulated glare conditions. An attempt was made to explore the relationship between the glare subjective responses and actual contrast sensitivity. Thirty-six individuals (9 high neuroticism scorers, 9 low neuroticism scorers, 9 high extraversion scorers, and 9 low extraversion scorers) were tested on subjective discomfort glare rating responses and visual contrast sensitivity. The International Personality Item Pool (IPIP) was used to assess trait-based individual differences, while the subjective glare experience was examined utilizing modified glare De Boer discomfort rating scale. The visual performance was measured through the contrast sensitivity level using adjustable contrast level of the Landolt's C target. Results indicated significant effect of extraversion trait on rating response while insignificant effect on visual related performance. The relationship between rating response and visual performance was also found to be quite minimal. In conclusion, the expected model was supported but only on the extraversion trait. Overall, the research was directed towards improving our understanding of influencing factors on the experience of discomfort glare, which may eventually have practical implications in the design of glare measurement methods, training and selection of drivers and workers who work under conditions of glare.