Strabismus is a group of disorders related to binocular vision and eye movements, which are diagnosed by ancillary tests and signs and symptoms. Strabismus is mainly characterized by the appearance of deviation of the eyeballs, inability to look at the same object with both eyes, possible limitation of eye rotation, susceptibility to visual fatigue, diplopia, photophobia, and so on. The ophthalmologic examination to determine strabismus mainly includes ocular appearance examination, visual acuity examination and refractive examination, movement of the eyeballs, and auxiliary machine examination (including oblique angle of vision examination and Worth four-dot light test). Symptoms and examination need to be performed together to better identify strabismus. Patients with strabismus should receive timely treatment, pay attention to daily eye hygiene, rest, avoid overexertion of the eyes, avoid staying up late, and have balanced nutrition.