| Definition: | process by which the state of the visual system is modified by previous and present exposure to stimuli that can have various luminance values, spectral distributions and angular subtenses Note 1 to entry: Adaptation to specific spatial frequencies, orientations, sizes, etc. is recognized as being included in this definition. Note 2 to entry: This entry was numbered 845-02-07 in IEC 60050-845:1987.
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