At the last meeting of the Ophthalmological Section of the American Medical Association, I presented a report on the above subject, accompanied by tabulated statistics. In order to accumulate material for this report, I sent letters of inquiry and a question blank to every railroad in the United States, Canada and Mexico, operating over one hundred miles of road; 244 railroads were thus addressed, covering 205,638 miles of road. I received replies from 64 roads operating 90,950 miles of road. This left a large amount of mileage unaccounted for, and in order to endeavor to supply this deficiency, during the past year I communicated with all those roads failing to reply to my first communication. I received replies from 48 roads, making a total of 112 roads that have replied to my letters of inquiry. The roads thus heard from during the past year cover a mileage of 56,888 miles,
ALLPORT F. WHAT AMOUNT OF VISUAL DEFECT SHOULD DISQUALIFY IN RAILROAD SERVICE?. JAMA. 1902;XXXVIII(6):382–387. doi:10.1001/jama.1902.62480060020001f
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