There are two types of glare: discomfort glare
(annoying or painful sensation) and disability glare (impaired or reduced visibility).
to headlights is not uncommon, but there is a
General visual discomfort criteria have been investigated in several previous studies, including daylight discomfort glare
in perimeter offices with various fenestration attachments and variations in luminance patterns within the field of view.
New and different criteria--such as brightness, circadian stimulation, discomfort glare
, dynamic properties, movement and color saturation--are often much more useful in telling us how well the lighting achieves our goals in a certain context.
Its low reflection design helps to reduce discomfort glare
in Interior Lighting, Commission Internationale de l'Eclairage.
reduces the contrast of visibility of the object being viewed, while intense glare can lead to temporary vision impairment.
is a visual annoyance caused by luminance in the field-of-view that is considerably greater than the luminance to which the visual system is adapted [IES 2011].
In the case of excessively high luminance contrast or glass (mirror) surfaces in industrial buildings or working with computers, disability or discomfort glare
While it has been shown that the observer's gaze location (e.g., either fixed or free) does not significantly impact perceptions of discomfort glare
in the context of oncoming headlamps (Bullough et al., 2003), the impact of different viewing locations, especially upon the entrance of a curve while driving, on target detection is not well understood.
Lighting engineers make a distinction between discomfort glare
, which may not necessarily affect visual performance, and disability glare, which does.
is assumed to cause discomfort without necessarily impairing the vision of objects.