| vision by the normal eye in which cones are the principal active photoreceptors Note 1 to entry: Photopic vision normally occurs when the eye is adapted to levels of luminance of at least 5 cd·m−2. Note 2 to entry: Colour perception is typical of photopic vision. Note 3 to entry: This entry was numbered 845-02-09 in IEC 60050-845:1987.
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