Children’s vision is different at different ages; the lower limit of normal vision for a three-year-old child is 0.5, and an eight-year-old child’s vision is close to that of an adult. Children’s vision varies by age. The lower limit of normal vision is 0.5 for three-year-olds, 0.6 for four- to five-year-olds, 0.7 for six-year-olds, and 1.0 and above for eight-year-olds who are close to adults. If a child’s naked eye vision is below the normal range, refractive errors and amblyopia may be present. Refractive error mainly includes myopia, hyperopia, astigmatism, optometry clear diagnosis can choose to wear appropriate glasses to correct; if there is amblyopia, you need to timely amblyopia treatment and training. Children’s visual acuity is lower than normal value should not be ignored, should be brought to the hospital in a timely manner, clear cause of the disease to take active treatment measures, so as not to delay the condition.