Contrast Sensitivity Measured in Low Levels of Red, White, and Blue Ambient Illumination

摘要

Average contrast sensitivity functions were determined for six observers in the dark and under three colors of dim, ambient illumination. Measurements were taken with two different CRT screen brightnesses. The color of the illuminant did not affect the shape of these functions, or change sensitivity relative to a dark background. But the shape of the functions was changed by the screen luminance, consistent with other data in the literature. The frequent preference in submarine sonar shacks fo blue light, over the customary red, is, therefore, due to factors other than enhanced contrast of the visual displays. (Author)