retinal illuminance

retinalilluminance

Luminous flux incident on the retina. The simplified formula isT = LSwhere L is the luminance of the stimulus in cd/m² and S is the area of the pupil in mm². The retinal illuminance T is then given in trolands. Retinal illuminance decreases with age due to absorption of the lens and to a reduction in pupil size. It may represent a reduction of as much as 30 fold in an 80-year-old eye as compared to a 20-year-old eye. Syn. retinal illumination. See troland; vignetting.

单词	retinal illuminance
释义	retinal illuminance retinal illuminance [′ret·ən·əl i′lü·mə·nəns] (optics) A psychophysiological quantity which is a measure of the brightness of a visual sensation; it is measured in trolands. retinal illuminance retinalilluminance Luminous flux incident on the retina. The simplified formula isT = LSwhere L is the luminance of the stimulus in cd/m² and S is the area of the pupil in mm². The retinal illuminance T is then given in trolands. Retinal illuminance decreases with age due to absorption of the lens and to a reduction in pupil size. It may represent a reduction of as much as 30 fold in an 80-year-old eye as compared to a 20-year-old eye. Syn. retinal illumination. See troland; vignetting.
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