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Glare
Blinding Glare
Direct Glare
Discomfort Glare
Disability Glare
Reflected Glare
Veiling Luminance
Veiling Reflection
(Terms of physiology)
Glare is an interference with visual
perception caused by
an uncomfortably bright light source or reflection;
a form of visual noise.
In its simplest form, glare is a consequence of the
normally helpful capability of the human eye to adapt
to different light levels.
In the case of glare, the eye adapts to the high
level of the glare source, which makes it hard to
perceive details in the now "too dark" work area.
Direct Glare is glare resulting from
high luminances in the visual environment that
are directly visible from a viewers position. Examples can
be a sunlit surface inside or outside a building,
or an insufficiently shielded luminaire.
Reflected Glare or
Veiling Reflection
is a reflection of incident light that partially
or totally obscures the details to be seen
on a surface by reducing the contrast.
Discomfort Glare is glare
which is distracting or uncomfortable,
which interferes with the perception of visual
information required to satisfy biological needs,
but which does not significantly reduce the ability
to see information needed for activities.
Disability Glare is glare
which reduces the ability to perceive the
visual information needed for a particular activity.
Disability glare is caused by light scattered within the eye,
causing a haze of veiling luminance that decreases contrast
and reduces visibility.
Blinding Glare is glare which is so
intense that for an appreciable length of time after
it has been removed, no visual perception is possible.
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