The visual requirements for the soldier of the United States Army were formerly normal vision, or 20/20.
Investigations of Bannister and Shaw tended to show that with a vision of 20/40 or even 20/70 a clear enough vision of the bull's eye of a target could be obtained to enable the soldier to shoot with a fair degree of accuracy, and that if one eye possessed 20/40, this was sufficient. As a result of these investigations the requirements of vision in the Army were changed so as to read:
1. For the line of the Army and for the Signal Corps: 20/40 for the better eye and 20/100 for the poorer eye, provided that no organic disease exsits in either eye.
Recruits may be accepted for the line of the Army when unable with the better eye to correctly read all of the letters on the 20/40 line, provided they
WILDER WH. VISUAL STANDARDS OF THE UNITED STATES ARMY. JAMA. 1918;71(4):266–268. doi:https://doi.org/10.1001/jama.1918.26020300004009a
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