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为了在镜框内正确地安装透镜,我们必须知道透镜的顶点和接触环间的轴向距离,透镜表面的顶点位置由矢高确定。
In order to properly mount the lens in the frame, we must know the axial distance between the apex of the lens and the contact ring, and the apex of the lens surface is determined by the sagittal height.