. A treatise on nervous and mental diseases, for students and practitioners of medicine. ands directly over the white of the eye, there may bean equilibrium of ocular movement; but if the red light go tothe left, there will be insufficient adduction, aod if it go to theright, insufficient abduction. If the lights, however, stand verti-cally, the candle should be moved several feet to the right or to theleft, or the patient should be made to turn his head far to the rightand then to the left, still regarding the flame; and in these lateralpositions lack of perpendicularity will detect the fault
. A treatise on nervous and mental diseases, for students and practitioners of medicine. ands directly over the white of the eye, there may bean equilibrium of ocular movement; but if the red light go tothe left, there will be insufficient adduction, aod if it go to theright, insufficient abduction. If the lights, however, stand verti-cally, the candle should be moved several feet to the right or to theleft, or the patient should be made to turn his head far to the rightand then to the left, still regarding the flame; and in these lateralpositions lack of perpendicularity will detect the faulty muscle. Ifthe abductive power is more than eight degrees, insufficient adduc-tion may be suspected, and this should be tested for by prisms withthe base outward, increasing the strength of these prisms until thepatient is no longer able to fuse the images. But as these testsshould not be undertaken without proper correction of any error ofrefraction, the thorough method cannot be described in a book ofthis kind, and reference must be had to treatises upon the eye. Fig. 91. Fig. 92,.
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