Adaptation Luminance
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Adaptation Luminance
The average
luminance (or brightness) of those objects and
surfaces in the immediate vicinity of an observer. Also called
adaptation brightness, adaptation level, adaptation illuminance.
The adaptation luminance has a marked influence on an observer's
estimate of the visual range because, along with the visual angle
of the object under observation, it determines the observer's
threshold contrast. High adaptation
luminance tends to produce
a high threshold contrast, thus reducing the estimated visual
range. This effect of the adaptation luminance is to be distinguished
from the influence of background luminance.
References
This article is based on NASA's Dictionary of Technical Terms for Aerospace Use
