Intermittent exotropia is a transitional type of strabismus that occurs between exotropia and permanent exotropia. As the brain loses control with age, it eventually loses its ability to compensate and becomes a constant exotropia. The distinctive feature of this disease is that the exotropia is intermittent, and there is a tendency to squint in bright outdoor light. Unlike emmetropia, it has no conscious symptoms and occurs only when the mind is inattentive, dazed, or fatigued. There is no specific association with refractive error and there is no or little amblyopia. Treatment is mainly surgical. In the past, some scholars advocated that intermittent exotropia should be controlled through training to avoid the pain of surgery. Studies have shown that the training may have a temporary effect, but it cannot correct the eye position and can only be used as an adjunctive treatment, not as a substitute for surgery. In particular, care should be taken not to delay the surgery due to the training. In particular, collection training should not be performed prior to surgery; otherwise, overcorrection of eye position is likely to occur. Surgery before impaired monovision in both eyes Surgery is preferred for intermittent exotropia, but the timing of surgery should take into account the size of the strabismus angle, the frequency and duration of dominant strabismus, and the patient’s age and fusion status. If intermittent exotropia has been diagnosed, the monocular function of both eyes should be checked regularly. Surgery should be performed as early as possible before dominant strabismus develops and before there is complete loss of monocular function in both eyes. The best results are achieved at the age of 4 to 6 years.