(redirected from glare source)
Also found in: Dictionary, Thesaurus, Medical, Legal.


The interference that arises when an attempt is made to place a telephone call just as an incoming call is arriving; in the case of data transmission under the control of a computer, this can render the line or even the computer temporarily inoperative.
Discomfort produced in an observer by one or more visible sources of light. Also known as discomfort glare.
Visual disability caused by visible sources or areas of luminance which are in an observer's field of view but do not assist in viewing. Also known as disability glare.
Dazzling brightness of the atmosphere, caused by excessive reflection and scattering of light by particles in the line of sight.


A state that reduces the ability to perceive the visual information needed for a particular activity. It arises when some parts of the visual field are much brighter than their surroundings.

blinding glare

So intense that for an appreciable length of time after it has been removed, no visual perception is possible.

discomfort glare

Glare that is distracting or uncomfortable, interfering with the perception of visual information required to satisfy biological needs, it does not significantly reduce the ability to see information needed for activities.

direct glare

Results from high luminances directly visible from a viewer’s position.

disability glare

Reduces the ability to perceive the visual information needed for a particular activity.

reflected glare

The reflection of incident light that partially or totally obscures the surface details by reducing the contrast on a surface.


The sensation produced by brightnesses within the visual field that are sufficiently greater than the luminance to which the eyes are adapted to cause annoyance, discomfort, or loss in visual performance and visibility.
References in periodicals archive ?
Note that there is still discussion on how to select the daylight glare source luminance "threshold".
In actual workspaces the field of view (FOV) is centered in the task and, depending on the equipment layout, the glare source is somewhere around the task within the worker's FOV.
The primary limitation of these methods is that the boundary of the glare source must be pre-defined.
Given the statistical results of the percent of scene pixels exceeding the luminance thresholds that was just described, a different range of absolute values was tested with regard to glare source identification for use with glare algorithms.
The sunglasses darken only a small spot on each lens instead of the entire lens, so glare sources are dimmed dramatically, while everything else can be seen easily.
The luminaire's low glare and high uniformity benefits promote improved performance in security camera operation, since cameras are susceptible to glare sources and work better with a smaller range of scene brightness.