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.
Note 3 to entry: This entry was numbered 17-18 in CIE S 017:2011.