The e-ILV provides free access to all the terms and definitions contained in the international standard CIE S 017:2020 ILV: International Lighting Vocabulary, 2nd edition.

To search for another term please use  "Back to the list" to return to the main page or the e-ILV.

For the complete set of terms and definitions CIE S 017:2020 can be purchased from the CIE Webshop. Members of a CIE National Committee or Associate National Committee have access to a 66,7 % discount on the purchase price of the standard.


visual angle

angle subtended by an object or detail at the point of observation

Note 1 to entry: The SI unit for the visual angle is rad, although it can also be measured in milliradians, degrees, or minutes of arc.

Note 2 to entry: See also "angular subtense".

Note 3 to entry: This entry was numbered 17-1404 in CIE S 017:2011.

Publication date: 2020-12
Copyright © CIE 2020. All Rights Reserverd.