| Definition: | reciprocal of the least perceptible luminance contrast, usually expressed as L/ΔLth, where L is the average luminance and ΔLth is the luminance difference threshold Note 1 to entry: The value of Sc depends on a number of factors including the luminance, the viewing conditions and the state of adaptation. Note 2 to entry: The contrast sensitivity has unit one. Note 3 to entry: This entry was numbered 845-02-48 in IEC 60050-845:1987.
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