A child’s normal visual acuity is usually about 0.2 at age 1, 0.4 to 0.5 at age 3 to 4, 0.6 to 0.8 at age 5 to 6, and 0.8 to 1.0 at age 7 to 8. When infants are born, the eyeballs are relatively small, the eye axes are short, and the refractive state of the eyes is hyperopia. As the body develops, the eyeball gradually becomes larger and the eye axis grows. As a result, the refractive state of the eye gradually changes from farsightedness to orthopia, and the visual acuity gradually improves. In general, a child’s normal visual acuity is about 0.2 at the age of 1, 0.4 to 0.5 at the age of 3 to 4, and 0.6 to 0.8 at the age of 5 to 6. When a child is about 7 to 8 years old, the visual acuity can be close to the adult level, reaching 1.0. Parents who find that their child’s vision is below the normal range are advised to bring their child to the doctor in a timely manner for active intervention and treatment, if necessary, to avoid adverse consequences.