The visual requirements of the Navy may in general be said to be more severe than those of the Army. At the same time they are simpler and more definite, both because of the much narrower latitude allowed for correction by glasses and because they are more categorical, since such requirements readily lend themselves to categorization through a consideration of the various branches and ratings of the service.
Also the visual requirements of the United States Navy may be said to be more severe than those of other countries having large navies, since conditions governing the physisical requirements in the larger foreign navies are necessarily different from our own. In only one, that is in the British navy, does the system of voluntary enlistment prevail. In others, the recruits are subjects of a universal draft system, the sea-faring districts furnishing conscripts so far as needed for the navy, recruits from
CARSON WE. VISUAL REQUIREMENTS OF THE UNITED STATES NAVY. JAMA. 1918;71(4):263–266. doi:https://doi.org/10.1001/jama.1918.26020300001009
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