目的：应用改变近用老视镜的光学中心所产生的三棱镜效应，消除老视患者近距离阅读和工作的肌性视疲劳。
AIM: To evaluate the therapeutic effects of using prism effect in the correction of muscular asthenopia by changing optical center of presbyopic glasses.
通过移动老视镜的光学中心的方法，产生三棱镜效应，按外隐斜度数的1/2～1/3给予三棱镜度，平均加在左右2眼。
The prism effect produced by moving optical center of presbyopic glasses was put on the right and left lenses averagely by 1/2-1/3 degree of exophoria.
通过移动老视镜的光学中心的方法，产生三棱镜效应，按外隐斜度数的1/2～1/3给予三棱镜度，平均加在左右2眼。
The prism effect produced by moving optical center of presbyopic glasses was put on the right and left lenses averagely by 1/2-1/3 degree of exophoria.
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