Abstract
Disability glare is associated with veiling luminance caused by light from bright sources being scattered within the eyes of observers, thereby reducing retinal luminance contrast. This study compares the reduction in observers’ performance in the presence of glare with veiling luminance in the eye, calculated using a non-subjective method. A total of 42 observers performed a target detection task in the presence of a glare source in conditions similar to street lighting at night. Luminance contrast thresholds were measured for each observer under different levels of glare. Results show that, while veiling luminance has a significant effect on the performance of observers, its effect is lower than expected from contrast loss. Furthermore, the performance of observers over the age of 50 is unaffected by increasing the glare level.
Highlights
Improved street lighting, in general, is widely thought to be an effective means of reducing the likelihood of road traffic accidents for pedestrians, cyclists and vehicle users
This study focuses on the impact of glare on road users’ performance in conditions similar to street lighting
The results of this study confirmed that veiling luminance caused by glare sources increases threshold luminance contrast
Summary
In general, is widely thought to be an effective means of reducing the likelihood of road traffic accidents for pedestrians, cyclists and vehicle users. In this context, glare has long been recognised as one of the main issues; this is due to the fact that glare from street lamps and vehicle headlamps can cause a reduction in the conspicuity of objects and discomfort for both motorists and pedestrians. 1.1 Veiling luminance Disability glare has been studied for many years, with perhaps the key initial work in the area being carried out by Holladay.[3] The proposed mechanism for disability glare is that light is scattered by the ocular media, and this results in extra light being added to areas of the retina surrounding the area directly illuminated by the glare source. Older people tend to have more problems in coping with glare sources and this makes lighting difficult since they need more light to perform common visual tasks.[5]
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