Influence of Stimulus Duration on Discomfort Glare for Persons With and WithoutVisual Correction

摘要

This laboratory study investigated the effects of stimulus duration and thenature of visual correction on discomfort glare. The experimental setup simulated a nighttime driving situation with an opposing glare source at 3.5 degree of visual angle. There were 25 different glare stimuli, obtained by combining each of five levels of duration (ranging from 0.125 to 2 seconds) with each of five levels of illuminance (ranging from 0.5 to 8 lux). Two groups of subjects participated: those needing no visual correction, and those needing correction and having both contact lenses and spectacles. The latter group of subjects used their contact lenses in one half of the trials and their spectacles in the other half of the trials. Discomfort glare was evaluated using the DeBoer discomfort-glare scale. Neither presence of correction (either contact lenses or spectacles versus no correction) nor type of correction (contact lenses versus spectacles) had a statistically significant effect discomfort glare. When averaged across subjects, both duration and illuminance had statistically significant effects of discomfort glare, although subjects' discomfort judgments were less affected by duration by illuminance.