. Dr. Evans' How to keep well; . The margin between earningsand the cost of living is not great enough to allow for many fines. They need extra good muscles to stand this strain. Nothing in theirlives makes for good muscles. Their muscle strain passes into neurastheniaand general tire. Therefore it is that a large part of the garment workers DANGER TO THE EYES 121 are neurasthenic. Nothing is more hysteric and neurasthenic than a garmentmakers strike. The employer whose factory conditions make against mental poise attimes feels most keenly the effect of that lack of poise. Whenever an employer
. Dr. Evans' How to keep well; . The margin between earningsand the cost of living is not great enough to allow for many fines. They need extra good muscles to stand this strain. Nothing in theirlives makes for good muscles. Their muscle strain passes into neurastheniaand general tire. Therefore it is that a large part of the garment workers DANGER TO THE EYES 121 are neurasthenic. Nothing is more hysteric and neurasthenic than a garmentmakers strike. The employer whose factory conditions make against mental poise attimes feels most keenly the effect of that lack of poise. Whenever an employerthinks his employees are most hysterical, it is well for him to inquire if theconditions of his employment do not make for hysteria. Miners nystagmus, a jerking of the muscles which move the eyeballs, isthe result of another kind of eyestrain. Cohen found that 45 per cent of theGerman lithographers and 51 per cent of the typesetters suffered from pro-gressive nearsightedness. In addition, he found that 10 per cent of the blind-. Fig. 61.—In Every Normal Eye There is a Normal Blind Area. Close one eye and gazesteadily at the cross. Hold the paper ten or twelve inches from the eye Move it to andfrom the eye. At the proper distance the white spot will not be seen. ness in Germany developed out of this variety of shortsightedness. Ordi-nary shortsightedness tends to be automatically corrected as age advances. DANGER TO THE EYES Nature intended that man should see. For the purpose a most intricatepiece of apparatus was made—the eye. No machine made by man is soelaborate or so perfectly put together. This machine is made in is covered well and provided with a well-nigh perfect dust removing ap-paratus. To serve it twelve muscles are provided. Of the twelve importantnerves which come off directly from the brain, one-third, or four, are for theservice of the eyes. As we start off, or soon after, we are endowed with good eyes. How dowe preserve the asset given us ? If w
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