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January 1941


Arch Ophthalmol. 1941;25(1):158. doi:10.1001/archopht.1941.00870070172023

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In the article by Drs. Bertha L. Isaacs, Frederic T. Jung and Andrew C. Ivy entitled "Clinical Studies of Vitamin A Deficiency : Biophotometer and Adaptometer (Hecht) Studies on Normal Adults and on Persons in Whom an Attempt Was Made to Produce Vitamin A Deficiency," in the October issue (Arch. Ophth. 24: 698, 1940), an error occurred in the units employed in expressing rod and cone thresholds. The label reads "micromillilamberts" but should have been "log micromicrolamberts." The technic used by the authors was the same as that employed by Dr. Selig Hecht and his co-workers, i. e., a three minute light adaptation to 1,500 millilamberts, using for dark adaptation a 3 degree test field 7 degrees out.

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