Ever since Donders pointed out the close connection of optical defects of the eye with cranial pain, innumerable papers and statistics have been published tending to estimate the influence of ocular pathologic processes and of refractive and muscular anomalies on the production of cephalalgia. In other branches of medicine, headache as a diagnostic aid is of limited value. Its presence in the majority of ailments precludes consideration of it as a symptom of a particular disease ; hence, most textbooks on general medicine make slight reference to headache. In ocular conditions, however, it is different ; cranial pain, as a rule, is stimulated by the use of the eye and subsides when the eye is at rest or when the defect is corrected; consequently, it becomes to the laity and even to some members of the medical profession a symptom pathognomonic of eyestrain.
There is, however, no subject in the
GORDON BL. IMPORTANCE OF CEPHALALGIA IN OCULAR DIAGNOSIS. Arch Ophthalmol. 1934;11(5):769–796. doi:10.1001/archopht.1934.00830120029004
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