Abstract

Subjective spectral band limits have been established under controlled conditions as to dark adaptation of the eye, luminance of the spectrum (0.8 millilambert at 555 mμ) at the eyepiece slit, small visual angle (2.2°) of the slit, and observed band width of 0.6 mμ at 400 mμ to 1.3 mμ at 700 mμ. One hundred and twenty-five students have been subjected to the test. Color-blind persons were excluded. The mean values of transition points established by these tests are as follows: Transition from infra-red to red, 744 mμ; red to orange, 614 mμ; orange to yellow, 597 mμ; yellow to green, 582 mμ; green to blue, 514 mμ; blue to violet, 476 mμ; and violet to ultraviolet, 419 mμ.

Color transitions of some color-blind subjects, exceptional subjects and subjects pre-exposed to various conventional light sources, are also given.

© 1950 Optical Society of America

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