Abstract

Determinations are made of the minimal intensities in mile-candles at which color-deficient observers could distinguish red and green point sources falling within or just outside the chromaticity limits proposed by Judd. For colors within these limits the minimal intensities are closely related to scores on the Air Forces Color Threshold Test. When slightly yellower greens are included the task is more difficult for the color-deficient observer.

© 1955 Optical Society of America

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