. A treatise on the diseases of the eye. wards the left median line, he will miss hitting itby going too much to the left side of it. The reasonof this is, that the insufficiently innervated externalrectus requires to make a contraction far exceedingthe extent of the required movement, and far greaterthan would be necessary if the innervation werenormal. In consequence of this, the patient over-estimates the amount of movememt and believesthe object to lie further to the side of the affected muscle than it really does, and consequently strikes too much to the the paralytic affection is
. A treatise on the diseases of the eye. wards the left median line, he will miss hitting itby going too much to the left side of it. The reasonof this is, that the insufficiently innervated externalrectus requires to make a contraction far exceedingthe extent of the required movement, and far greaterthan would be necessary if the innervation werenormal. In consequence of this, the patient over-estimates the amount of movememt and believesthe object to lie further to the side of the affected muscle than it really does, and consequently strikes too much to the the paralytic affection is not too complicated, the patients in time learn tocorrect these errors of projection. The dizziness which they often complainof is not necessarily due to a cerebral lesion, but is generally owing to theconfusion which arises from the diplopia, and the erroneous projection ofthe visual field. [Von Graefes method is more complicated but somewhat more exact. Byits means he is enabled to determine the degree of the squint and the relations. 1 Meyer and Galezowski have more lately devised binocular strabismometers, wbicliare, however, more expensive and less handy. 2 [Medical Times and Gaz., 1869, i. 401.—H.] 680 AFFECTIONS OF THE MUSCLES OF THE EYE. of the squinting eye to its collective motion in the horizontal plane, and healso makes the measurements directl} upon the scleral curvature, all startingfrom the external commissure of the lids. (See Graefe u. SaemischsHandb. d. Aug., vi. 1, S. 98.)—B.]. [Fig. 214]
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