Conclusion:Symmetric recession of internus in alternative esotropia can improve the success rate and the binocular vision function.

交替内视手用同等量内直肌后徙，不但手成功率高，而且有利于手后双眼三级功能的建立。

Objective To study the optimal time for operation of intermittent exotropia, so that we can orthopia strabismus and attain normal binocular function.

目的探讨间歇视最佳手时机，以求达到矫正视并获得完善的双眼单视功能目的。