After the occurrence of strabismus, patients can show double vision, double vision, fear of light, tears and like to close one eye to see things, and easy eye redness, visual fatigue and other different symptoms, sometimes see things very close, while some patients usually show crooked head to see things, especially when watching TV is more obvious. The degree of strabismus is relatively stable in some people, while in others, the degree of strabismus is large and small, and can be controlled orthophoria, which is an intermittent strabismus state. Some people with strabismus may not have any symptoms, but only a sense of eye misalignment in appearance.