Abstract
Although the validity of the dark adaptation test for showing mild degree of a vitamin A deficiency is now generally acknowledged, there are many contradictory reports concerning the effect of vitamin A on the dark adaptation. The effect of vitamins other than A on it is yet uncertain. The results of the present experiment indicate
that most of the impaired dark adaptation for children can be cured by the supplement of ascorbic acid, vitamin B and milk together with vitamin A. Discrepancies among reports on the effect of vitamin A on the improvement of dark adaptation in the past may be explained by the facts that the diets of their subjects had been deficient in some nutrients other than vitamin A.
