—The object of this study was to obtain a record written by the ocular muscles themselves of the fatigue which they develop under various circumstances. This was with the expectation—which has apparently been realized—that the data thus furnished would enable us to separate more clearly the factors which, when grouped together, have been called "eye-strain."
—The autographic records here referred to have been made by a modification of the ergograph. This is a piece of apparatus well known to physiologists, and described now in all of the text-books on that subject. But as it is important for our purpose to understand the principle on which it depends, its construction and action, it is desirable first to consider briefly the measurement of fatigue in other muscles, in animals and in man.
II. FATIGUE OF MUSCLES OF THE HAND OR LEG AS MEASURED BY THE ERGOGRAPH
HOWE L. MEASUREMENT OF FATIGUE OF THE OCULAR MUSCLES. JAMA. 1912;LIX(12):1024–1028. doi:10.1001/jama.1912.04270090268046
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