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)

Contrast

Celsius (previously Centigrade)

Capacitance

charge current

Intensity

Illuminance

Energy

International Association of Marine Aids to Navigation and Lighthouse Authorities - AISM