A study of individual differences in motion acuity at scotopic levels of illumination.

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Abstract
A group of 28 male subjects, ranging between 17 and 26 years of age and with a Snellen Index of 20/20 or better, were dark-adapted and given a motion acuity test under two levels of illumination (log - 3.4 ml. and log - 4.0 ml.), at 6 retinal positions ranging from 7° to 55°. Results showed that for each level of illumination the motion acuity function was found to be regular, rising gradually with increase in peripheral angle. Average threshold values for the two levels yielded a rank order correlation of .94 ± .18. Marked individual differences were observed, the threshold value for the lowest subject being 40 times as large as that for the highest. No significant relationship was found between the Snellen Index and motion acuity threshold values. A proposal is made for a short and simplified test of scotopic motion acuity for selecting night fliers. (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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