| vision by the normal eye in which rods are the principal active photoreceptors Note 1 to entry: Scotopic vision normally occurs when the eye is adapted to levels of luminance of less than 0,005 cd·m−2. Note 2 to entry: In comparison with photopic vision, scotopic vision is characterized by the lack of colour perception and by a shift of the visual sensitivity function towards shorter wavelengths. Note 3 to entry: This entry was numbered 845-02-10 in IEC 60050-845:1987.
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