The effect of discomfort glare on parallel processing of visual information
The effect of discomfort glare on parallel processing of visual information
复制标题
不舒适眩光对视觉信息并行处理的影响
DOI：
10.1111/j.1755-3768.2012.4283.x
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发表时间：
2012
影响因子：
3.4
通讯作者：
BARGARY G
中科院分区：
文献类型：
--
作者：
BARGARY G
目的当人在昏暗的背景下面对明亮的光源时，散射光除了会降低视网膜上的物体对比度外，还会导致视觉不适。以前关于眩光对视觉表现影响的研究主要集中在视网膜图像对比度的降低(称为残疾眩光)，而不是经常伴随的不适眩光体验。本研究考察了视觉信息的并行处理在不舒适的眩光条件下是如何受到影响的。方法受试者在其上执行标准对比敏度(CA)任务的显示器周围有光散射源。所有的CA任务都是在有和没有不适眩光的情况下进行的(在先前的实验中估计)。在平行任务中，一个中心凹目标(Landolt C)和四个外围刺激(三个牵引物和一个目标)同时呈现；被试必须同时指出中心凹目标和包含外围目标的象限的间隙方向。周边靶点的大小相对于中心凹靶点增大，以确保所有靶点均可被检测到。结果不舒适眩光的存在会降低平行加工任务中的视觉表现，即使进行了调整以抵消残疾眩光的影响。结论只关注残疾眩光的研究可能低估了眩光光源对视觉表现的不利影响，特别是在现实世界中，经常需要注意中心凹和周围的物体。
PurposeWhen a person is confronted with a bright light source against a dim background, scattered light can cause visual discomfort in addition to reducing object contrast on the retina. Previous work addressing the effect of glare on visual performance has focused mainly on the reduction in retinal image contrast (known as disability glare) rather than the often accompanying experience of discomfort glare. This study examines how parallel processing of visual information is affected under conditions of discomfort glare.MethodsLight scatter sources surrounded a monitor on which the subject carried out standard contrast acuity (CA) tasks. All CA tasks were carried out with and without discomfort glare (estimated in a prior experiment). In the parallel task, a fovea target (Landolt C) and four peripheral stimuli (three distractors and one target) were presented concurrently; the subject had to indicate both the orientation of the gap for the foveal target and the quadrant containing the peripheral target. The size of the peripheral target was increased relative to the foveal target to ensure that all targets were equally detectable. This was done separately with and without discomfort glare, thus negating any influence of disability glare.ResultsThe presence of discomfort glare degrades visual performance in the parallel processing task even when adjustments are made to cancel out the effects of disability glare.ConclusionStudies that have focused only on disability glare may be underestimating the adverse effect glaring light sources can have on visual performance, particularly in real world scenarios where attention to objects in both the fovea and periphery is often required.