. Refraction and how to refract : including sections on optics, retinoscopy, the fitting of spectacles and eye-glasses, 180 0 75 90 105 Fig. 100. — Illustrating 75 90 Fig. IOI.—Illustrating AsymmetricAstigmatism. added together would not make 180 degrees, but more than180 degrees. (See Fig. loi.) Or, if the astigmatism inthe right eye was at 35 degrees, and the left at 90 degrees,then these added together would not make 180 degrees. Symmetric astigmatism generally accompanies a regularphysiognomy, the center of each pupil being at an equaldistance from the median l
. Refraction and how to refract : including sections on optics, retinoscopy, the fitting of spectacles and eye-glasses, 180 0 75 90 105 Fig. 100. — Illustrating 75 90 Fig. IOI.—Illustrating AsymmetricAstigmatism. added together would not make 180 degrees, but more than180 degrees. (See Fig. loi.) Or, if the astigmatism inthe right eye was at 35 degrees, and the left at 90 degrees,then these added together would not make 180 degrees. Symmetric astigmatism generally accompanies a regularphysiognomy, the center of each pupil being at an equaldistance from the median line of the face. Asymmetricastigmatism usually accompanies an as)-mmctric i)h\siog-nomy, the center of one pupil being further from themedian line of the face than the other. ASTIGMATISM. 129 Muscular insufficiency, hereafter to be described, is muchmore common, and, in fact, should be looked for or antici-pated in cases of asynmietric astigmatism. 5 and 6. Astigmatism with the Rule and AstigmatismAgainst the Rule.—Astii^matism with the rule and asti<^-matisni against the rule refer to the condition alreadydescribed as that in which the vertical meridian of the eye,as a gener
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