A 10-year-old boy has an abnormal 0.8 left eye but normal 1.0 vision in the right eye. A visual acuity of ≥1.0 is usually regarded as normal in clinical practice, so parents should be alerted to monocular myopia or amblyopia if the left eye is abnormal at 0.8 and the right eye is normal at 1.0. Generally, the causes of different visual acuity between the two eyes of a 10-year-old boy include refractive error, refractive error and keratitis in one eye, congenital cataract, and long-term improper use of the eyes, etc. If you want to clarify the visual acuity, please contact us. If you want to clarify whether the vision is normal or not, you need to do other examinations to make a comprehensive judgment. For those who are clearly nearsighted or farsighted in one eye, they can be corrected by wearing appropriate frames, so that the vision of both eyes is in a balanced state. If the problem is caused by diseases such as keratitis or congenital cataracts, it is necessary to actively cooperate with the doctor in treating the disease so as to promote the return of normal vision. Parents are advised to bring their 10-year-old boys to regular hospitals for examination and treatment, and to pay attention to developing good eye habits, avoiding overuse of the eyes, as well as moderate intake of carrots, blueberries and other anthocyanin-rich, vitamin-rich foods.