Intermittent exotropia is the most common form of exotropia in children, with varying ages of onset, but often occurring between 6 months of age and 4 years of age. Almost all patients with intermittent exotropia have some degree of fusion, but due to a deep inhibition of the temporal retina, this small peripheral fusion is often broken after inattention, fatigue, and close reading due to low fusion function, gradually developing from an occult strabismus to a dominant strabismus. The most common symptom of intermittent exotropia in children is the tendency to close one eye under bright light. Parents often present their children with complaints of the tendency to close one eye under bright light or sometimes one eye is skewed outward, while adults present with complaints of vision-related symptoms, such as diplopia, visual fatigue, eye swelling and pain when reading for a long time, headache, etc. The goal of exotropia surgery is to restore orthophoria in both eyes and establish good binocular vision. Patients with intermittent external strabismus should decide the timing of surgery according to the fusion function and the monocular function of both eyes in order to facilitate the reconstruction and consolidation of the monocular function of both eyes. When the strabismus is intermittent, it is easy to appear in the state of fatigue or when alert, when it can be eliminated by blinking or changing the gaze, when surgery can prevent the formation of inhibited blind spot. If the patient can only close or cover one eye in order to see, this indicates that the exotropia is so large that it cannot be controlled orthophorically by fused pooling, so that the patient sees things with double vision and can only eliminate diplopia by closing or covering one eye, and then surgical correction is necessary to improve the symptoms. In intermittent exotropia, the degree of strabismus is unstable, manifested as positive eye position when looking at near objects and concentrating on them; exotropia appears when exposed to strong light, looking far away, fatigue, inattentiveness or covering one eye. Intermittent exotropia is mostly alternating gaze. Therefore, binocular vision is mostly normal; when the eye position is positive, there can be binocular vision, but it is mostly unsound, and with the increase of the strabismus degree and the increase of the frequency of exotropia, the binocular vision is mostly destroyed.