A 6-year-old child with 0.5 visual acuity is a serious case and needs to be treated for the cause of the problem. The normal visual acuity for a 6 year old is about 0.8, but 0.5 may be due to a refractive error or other medical conditions. If the corrected visual acuity is 0.8 or better, it is usually due to refractive error and needs to be corrected by wearing glasses or keratoplasty, etc. Otherwise, it may lead to further aggravation of myopia which may affect the patient’s normal life, learning and growth and development. If the corrected visual acuity is still abnormal, it is necessary to investigate other diseases causing vision loss such as fundus hemorrhage, etc. By treating the primary disease, the patient’s visual acuity can usually be restored or partially restored, and then corrective treatment can be targeted. It is recommended that the patient seek medical attention to determine the cause of the vision impairment, and to have the vision corrected or treat the primary disease under the direction of the doctor.