Normal vision in children has a certain relationship with age, and the standard of vision is different at different ages. Generally speaking, children aged 3 should be able to reach 4.6 naked eye vision, 4 years old vision of about 4.8, 5~8 years old naked eye vision should be able to reach 5.0, are normal vision. The critical period of human visual development is 0~3 years old, and the sensitive period is 0~12 years old. If the child’s vision is lower than the standard of the same age or the difference between both eyes is more than two lines, it means that there is a loss of vision, and you should go to the hospital in time for consultation. In life, let the child develop good eye habits, maintain good sitting posture, avoid reading and writing in a dim environment, avoid prolonged cell phone, watching TV, etc., and maintain sufficient sleep every day, which is conducive to the protection of eyesight. It is recommended that children with visual abnormalities should consult a doctor in a timely manner to assess their condition and follow the doctor’s instructions for treatment.