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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.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.


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.
Illustrated Dictionary of Architecture Copyright © 2012, 2002, 1998 by The McGraw-Hill Companies, Inc. All rights reserved


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.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
References in periodicals archive ?
Though SWA had hoped to find an LED solution, it found the LED luminaire it mocked up to be too glary. "To get a level of light that worked on a pedestrian level, the source was incredibly glary, and it seemed like if you tried to baffle the glare, you were really impeding the performance," says Slaney.
In contrast, the metal halide luminaire, which uses a 150-W T6 metal halide lamp and a 14-ft-high faceted square reflector, "puts out a beautiful distribution of light evenly with a fairly large pattern, and there's a point source of light that you see from the reflector but it's not glary. The way the reflector is engineered, it's very difficult to get a glare spot coming back in your eye, whether you are a pedestrian or a driver.
Oncoming headlights are bright and glary, but the same headlights when viewed during the day, when there is sufficient volumetric brightness from daylight, are not.
Titan spends most of its time well separated from the glary planet, by up to four times the width of Saturn's rings.
As to luminaires, in a recent experiment comparing a low brightness, deep-cell parabolic troffer to one with a convex lens basket with a wide-spread light distribution, where both are installed in identical 10-ft by 10-ft offices, 60 unsophisticated observers came up with the following conclusion: They overwhelmingly voted that the low brightness parabolic was less glary than the convex lens unit, but nevertheless, overwhelmingly agreed that they preferred to work in an office with volumetric brightness.
In any case, the reappearance of even such a bright star as Regulus may be hard to see on the Moon's glary, sunlit limb no matter what size telescope you use.
But existing fixtures were outmoded and glary, and the lighting track was poorly located, creating shadows and veiling reflections.
It's about magnitude 8.6 and spends most of its time well separated from the glary planet, by as much as four times the width of Saturn's rings.
You'll want to use a telescope; binoculars won't be enough for following stars in the final minutes or seconds as the Moon's glary, sunlit edge creeps up to them.
Try hiding glary Uranus just beyond the edge of the view.
He had first envisioned a dark-sky preserve in 1993, when he returned from viewing the pristine heavens of Mauna Kea in Hawaii to the glary skies in Quebec.