| smallest perceptible difference in luminance of two adjacent fields Note 1 to entry: A field superimposed on a second larger field (background) can also be taken as two adjacent fields. Note 2 to entry: The value of the luminance difference threshold depends on the methodology, luminance, and on the viewing conditions, including the state of adaptation. Note 3 to entry: The luminance difference threshold is expressed in candela per square metre (cd·m−2 = lm·m−2·sr−1). Note 4 to entry: This entry was numbered 845-02-46 in IEC 60050-845:1987.
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