In the early part of my professional pupilage, I heard a suggestion from the venerable Dr. John C. Warren, long since deceased, to this effect. He said: "When engaged in a long surgical operation of half an hour or more in duration, the eyes will sometimes become fatigued, and it will be difficult and unsafe to continue the operation with them in that condition. It is better, under such circumstances, to raise the eyes and let them rest upon some object in a distant part of the room, or, if you can leave the operation, step to the window and look out for a minute or two; you will then return with the eyes refreshed, and can see as well as ever." And more recently, one of the most eminent of American oculists has written, that "one great cause of injury to vision is the continuous application of the eyes
WILLIAMS JL. A SUGGESTION ON THE PROPER ALTERNATION OF REST WITH EFFORT, AS ESSENTIAL TO HEALTH AND STRENGTH. JAMA. 1885;V(13):344–345. doi:10.1001/jama.1885.02391120008001a
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