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The retinal illuminance in trolands caused by luminance and color of PC monitors

In this study, we evaluated the retinal illuminance in trolands, i.e., the total luminous flux that affects the surface of the retina. For this investigation the whole spectral chromaticity range was considered, for wavelengths from 390 to 660 nm, by means of the RGB system, and the equalization functions of color XYZ, which were exhibited by several PC monitors. The study consisted of presenting full-field chromatic stimulation (full screen of the monitor). The pupil changes were measured in mm/sup 2/, and they were obtained by image processing of video-oculographic images, which used a video camera with sensors and illumination in the infrared range. This is a necessary condition when the observer is dark-adapted in scotopic or photopic conditions. The results obtained of retinal illuminance were made for wavelength of 390 to 660 nm for ten subjects including at least two persons with different colour vision deficiencies.