For a baby about a month old, the vision at this time is light sense, which means that the child at this time may not be able to see the things around him clearly, but he is conditioned by light, so we can't ask the child to have a particularly good vision at this time.
When the child reaches the age of 3 months:
Children about three months old generally require a vision of about 0.02, that is, to ensure that children can see clearly what is in front of them, whether it is prohibited items or athletes' items, and can follow them instinctively. If a child about three months old can't have a certain perception of what is in front of him, it means that his eyesight is unhealthy at this time.
When the child 1-3 years old:
For a one-year-old child, the vision requirement is 0.2, for a two-year-old child, 0.4, and for a three-year-old child, 0.6. Children of this age can read the eye chart. If you play, you can use an eye chart to check whether your child's vision is normal.
When teenagers and children reach the age of 4-5:
The visual acuity of 4-year-old children is 0.8, and at the age of 5, the visual acuity will basically reach 1.0, which is close to that of normal adults. If the eyesight of children around 5 years old does not reach 1.0, it means that their eyes may have some problems at this time, but some children's later development is inevitable.