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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 ?
Indirect, layered lighting creates visual interest for sighted users without being glary.
The annual Geminid meteor shower should peak on the night of December 13-14, when, unfortunately, the Moon will be just a day past full and at its glary worst late at night.
The glary sources and exposed fixtures distracted visitors from the objects on display, including books, artifacts and art.
They're about magnitude 10, 10 1/2, and 10 1/2, respectively, and become increasingly hard to see nearer to Saturn's glary disk.
The lighting at its Madison, WI, office was glary and outdated, but the company couldn't afford a complete renovation, so retrofit specialist Energy Performance Lighting devised a solution that would provide new lighting using the existing fixtures.
To enliven the streetscape, SWA looked for a pedestrian-level luminaire that would "create points of visible light [along the street], light people's faces without being glary or harsh and comply with the dark sky legislation," says Slaney.
They're about magnitude 10, 101/2, and 101/2, respectively, and become increasingly difficult to see as they get nearer Saturn's glary disk.
For most people, the term is synonymous with the dimly lighted corridors, unshielded, glary sources, and unsightly fl uorescent luminaires that plague commercial buildings around the nation.
Find a spot with an open sky view and no glary lights.