In fact,vision problems are common in school age kids,research has shown that one in four school age children have vision problems,and the vision problem can affect their personality,learning ability and so on. then need timely medical treatment. In my opinion,I think refractive errors are the most common cause of vision problems in school-age children. If your child consistently holding a book too close or sitting too close to the TV,closing one eye to read, watch TV or see better, or complaining of headaches or tired eyes, frequent eye rubbing,if these signs are present and your child is getting, you have to pay attention.