Eleanor P. Hunt, Kenneth M. Hayden, Medical Evaluation of Nutritional Status. Part IX. The Reliability of Visual Threshold during Dark Adaptation as a Measure of Vitamin A Deficiency in a Population Group of Low Income, The Milbank Memorial Fund Quarterly, Vol. 20, No. 2 (Apr., 1942), pp. 139-168
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Hunt et al. (1942) studied this question.