Generally speaking, children’s eyesight is fully developed at the age of 8-9 years old, which is a critical period for children’s vision development and requires attention to eye health. Children’s vision development is a long process, after the birth of the child vision in the slow development, until the child 8-9 years of age, children’s eyesight development is complete, to reach the state of adults. By the age of 18, vision can be stabilized. Children before the age of 3 is the critical period of vision development, 3-8 years old is the sensitive period of children’s vision, if the child’s eyes during the period of disease, not only will affect the development of children’s eyesight, but also myopia, hyperopia, amblyopia and other problems. Parents are advised to take their children to the hospital regularly for vision checkups and eye disease screenings to understand the extent of children’s vision development and eye health, and to deal with any problems promptly.