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The subject of eye strain, including the need for wearing glasses, has for some years been rapidly forcing itself into prominence and has assumed an importance far beyond any expectation. It is in no sense a fashion or fad, though there are many such in medicine. The eyes are, and have been in the past, the unsuspected cause of a great variety of nervous disturbances that were never understood and never satisfactorily explained. Modern methods of study, which have lately accomplished such wonders in all branches of science, when applied to the eye have brought order and truth out of what had been a tangle of theory, supposition and uncertainty. The eye has always been studied simply as a part of the body, under physiology; it needed to be studied as an optical instrument, under optics, a branch of science in which our knowledge is mathematically accurate. Strange to say
DIXON LS. EYE STRAIN. JAMA. 1905;XLIV(16):1256–1258. doi:10.1001/jama.1905.92500430020001c
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