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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 ?
The position index of a glare source at the borderline between comfort and discomfort (BCD) in the whole visual field.
Large area glare sources and their effect on discomfort and visual performance at computer workstations.
Overall the presence of glare source had an effect on driving speed.
The speed reduction induced by the glare source obviously did not depend only on the background luminance.
Analysis showed that during Section 7 the SRR was significantly larger when a glare source was present than when it was absent.
The glare source may have made the driving task more difficult (i.
When presented on the left side in the direction of the glare source, they were detected on average at a distance of 20.
Glare sources for the DGI calculation were detected using the Radiance findglare tool assuming a threshold value of 1000 cd/[m.
Statistics of DGI and DGP Using Glare Source Identification of Various Absolute Luminance Values From 'findglare' dgi500 dgi1000 dgi2000 dgi3000 dgi4000 Paired t-Prob > < 0.
Different glare indices, including DGI, are calculated based upon the brightness, location, and apparent size of the glare sources and the background luminance for a particular viewpoint.
A higher percentage indicates potentially a larger area of glare sources within the scene.
2] value was for QU3 (I am satisfied with the amount of light for computer work) with the metric 'mean luminance of glare sources (7* Mean L Task)' as shown in Fig.