Abstract

A set of curves and two empirical formulas have been derived which represent the contrast sensitivity of the human eye when both the test-object and the test-field luminances are considerably lower than the adaptation level. Although derived to be used for the lighting of traffic tunnels, the data may be applied to a much wider range of visibility problems, as the results are not greatly dependent on changes in the experimental conditions.

© 1965 Optical Society of America

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