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A unit of the intensity of light falling on the retina, calculated as the product of luminance and pupil area. It is defined as the retinal illuminance produced by viewing a surface illuminated by 1 lumen per square metre through an artificial pupil with an area of 1 square millimetre centred on the natural pupil. [Named after the US psychologist Leonard Thompson Troland (1889–1932) who introduced it before it was adopted by the Optical Society of America in 1944]

Subjects: Psychology.

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