According to the published literature reports (OKN, VEP, PL) on measuring children's vision by different methods, most experts believe that the vision of newborns and children one month after birth is light perception-manual eyes, the vision of children at two months is 0.0 1, that of children at three months is 0.0 1-0.02, and that of children at four months is 0.02. 0. 1 at 8 months, 0.2-0.3 at 1 year, 0.4 at 2 years old, 3-year-old children's vision ≥0.5(4.7), 4-year-old children's vision ≥0.6(4.8), 5-year-old vision ≥0.8(4.9), and 6-year-old and above ≥ 650.
But this vision standard is just a standard. After all, everyone's vision development is different. Some children may be earlier, while others are later. But usually, when a child is about 6 years old, his vision can basically reach that of a normal adult.