Method A prism cover test in the oblique field of gaze,should be done on the eye which overaction of the inferior obliques is not obvious preoperatively.

• 方法术前下斜肌亢进不明显的一眼在斜肌注视野作三棱镜遮盖检查,治疗时采用相等量的下斜肌减弱术合并水平直肌的手术。