Citation

Uhlaner JE, Woods IA. Highw. Res. Board bull. 1951; 43: 17-31.

Copyright

(Copyright © 1951, National Research Council (U.S.A.), Highway Research Board)

DOI

unavailable

PMID

unavailable

Abstract

The hypothesis tested in this study was that there is no relationship between photopic and scotopic visual acuity. Selected photopic visual-acuity charts were administered to 202 subjects. The subjects were also tested with the army night-vision tester-r2x. Intercorrelations of all measures were computed using pearson project moment correlation techniques. Correlations were computed between the photopic and scotopic tests, correcting for attenuation in the photopic variables by utilizing reliability data from previous studies. A derived brightness-discrimination score was also computed. It is concluded that there is a positive correlation between the measures of photopic and scotopic visual acuity under conditions of this study. Data obtained indicate that further research may provide a means of identifying, by use of photopic wall-charts, a portion of a given population whose night-vision score would tend to be considerably above the means of the total population.