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Dark Adaptometer and Blood Vitamin A Measurements in a North Carolina Nutrition Survey

One Figure

Department of Physiology and Pharmacology, Duke University School of Medicine, Durham, North Carolina

Our results lead to the conclusions:

1. A single measurement of the visual threshold cannot be a reliable indicator of mild avitaminosis A. This is in agreement with the conclusion of Steven and Wald, who suggest the necessity of determining also the stability or lability of the threshold.

2. The level of vitamin A in the blood seems to be the most promising method of detecting mild avitaminosis A by means of a single test, although more data are needed to establish the range of normal and abnormal values.

3. The blood vitamin A and carotene levels are somewhat lower for the rural population tested than have been reported for other groups of normal individuals here and elsewhere.

Manuscript received 21 July 1941.

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