Abstract

The absolute visual threshold for an area 40° by 100° visual angle at a color temperature of 2050°K was obtained for seven observers. Two conditions were used, (1) turning the light on and (2) turning the light both on and off before a judgment was made. The average threshold for the six observers in the 24–36 year age range was 2.35 log μμL. No difference in threshold was found between the two conditions. High rank order correlations were found between threshold (μμL) and size of the dark adapted pupil and between threshold (trolands) and age.

© 1958 Optical Society of America

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