Photopic Vision
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2-1-330
Vision by the normal eye when adapted to levels of luminance of at least several candelas per square metre.
Note: The cone receptors of the retina are considered to be the principal active elements under these conditions, and the spectrum appears coloured.
Reference: C.I.E.
Please note that this is the term as it stands in the original IALA Dictionary edition (1970-1989)