Children always squint their eyes, the reasons mainly include long time use of eyes caused by visual fatigue or myopia is not fully corrected related. If children study for a long time, eye fatigue can be caused by visual fatigue, children may have blurred vision, eye soreness, photophobia and other symptoms, in order to alleviate eye discomfort, children will always squinting to see the performance. Children need to reduce the amount of time they spend with their eyes, especially in close proximity, such as playing with cell phones and reading and writing for long periods of time, to relieve eye discomfort. Children always squinting is also related to the myopia is not fully corrected, myopic children with blurred vision, if the myopia is not corrected in a timely manner, in order to see clearly, children may always squinting performance. It is recommended that children with squinting be seen in a timely manner to have their condition evaluated and treated as prescribed by their doctor.