The Incidence of Xerophthalmia and Night-Blindness in the United States—A Gauge of Vitamin A Deficiency

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Abstract
An inquiry among the leading eye specialists throughout the U. S. A. may be summarized by the statement that xerophthalmia is rare and night-blindness even more exceptional. The consensus of opinion was that there is no indication that either of these diseases has increased in frequency during the economic depression. It would seem as if a lack of vitamin A among the child and adult populations is uncommon, especially since night-blindness is a very early and purely subjective symptom of vitamin A deficiency, occurring before any ophthalmo-scopic evidence or microscopic lesion can be noted.

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