A RAPID visual test for vitamin A deficiency has been described by Gridgeman and Wilkinson1, by Haines2, and recently by Pett3. In this method the patient is first asked to view a strong light (of intensity I), for a standard time T. Then this light is suddenly switched off and the time t required to see a dim light of intensity i is noted. An excessively high value of t is taken to indicate abnormality.
Lancet, i, 905 (April 16, 1938).
Trans. Ophth. Soc., 57, Part 1 (1938).
NATURE, 143, 23 (1939).
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DITCHBURN, R. A Rapid Visual Test for Vitamin A Deficiency. Nature 143, 285 (1939). https://doi.org/10.1038/143285a0
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