HEADACHE AND EYESTRAIN.

Abstract

That a vast majority of all cases of headache, certainly nine-tenths, are due to eyestrain is a truth beyond question. That with headache, and often without it, a large indefinite proportion of digestional, nervous and psychic disease is due to the same cause is quite as true. A few cases may be due to malfunction or organic disease of other organs, but it is not known in how many of these cases eyestrain is the primary cause of these extraocular diseases; it is also unknown in how many the eyestrain may be the direct and contributing cause of the headache ascribed to the extraocular disease. PROFESSIONAL NARCOTISM. In 31 years the members of the American Ophthalmological Society have contributed three papers suggesting that eyestrain is the cause of some headache, and one member has contended that nasal disease, not eyestrain, is the cause of frontal headache. But there have been