Blurred eyes reading the words on the blackboard is a sign of vision loss. The most common cause for adolescents is refractive error, such as myopia or astigmatism, which can cause vision loss. When this symptom occurs, the first step is to go to the hospital for a vision and optometry examination, which will clarify whether there is refractive error in the eyes. If myopia or astigmatism does exist after the examination and causes a significant loss of vision, it is important to improve vision through various correction methods as early as possible. For example, wearing frame glasses or corneal contact lenses can improve vision, maintain clear visual quality, and avoid eye fatigue symptoms. Patients with myopia are advised to pay attention to maintaining proper eye use methods in general to try to slow down the growth of myopia.