Refractive error in children is related to genetic factors, environmental factors or eye diseases, etc. It is recommended to go to the hospital in time for checkup if you notice vision loss. 1. Genetic factors: It is usually due to the fact that one of the parents of a child has high myopia or astigmatism and other vision problems, which are passed on to the child and thus refractive errors occur. 2. Environmental factors: Children may have refractive errors due to irrational eye use in daily life, watching TV or cell phones for a long time, or always reading or writing in dark places, which may lead to refractive errors. 3. Eye diseases: for example, eye trauma, conical cornea, pterygium, etc., which can affect the normal shape and structure of the eye, and then cause refractive error in children. If a child develops refractive error, it is recommended to go to the hospital for examination in time, and then intervene as soon as possible after the condition is clarified under the guidance of the doctor, so as to avoid the refractive error from worsening.