1. characteristic of all sensations and perceptions that is specific to vision

2. radiation that is considered from the point of view of its ability to excite the human visual system

NOTE 1 This term has 2 meanings that should be clearly distinguished. When necessary to avoid confusion between these 2 meanings the term "perceived light" may be used in the first sense.

NOTE 2 Light is normally, but not always, perceived as a result of the action of a light stimulus on the visual system.

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