Generally speaking, vision refers to the minimum separable vision of the eyes, not the minimum visible vision, so the eye chart reflects the minimum visual angle separated by the two points of the subject's gaze, that is, the minimum separable vision or 1 visual angle vision, which can represent the subject's best visual function.
When the child is 1 month old, his vision is light; When it is 3 months old, it is 0.02, which means that it can track moving objects in front; 1 0.2 at age; 0.4 at the age of 2; At the age of 3, it is 0.6, that is, you can look at the eye chart and check your vision with the eye chart; 0.8 at the age of 4; At the age of 5, you can reach 1.0, which is adult vision. If not, you should go to the hospital as soon as possible. At the age of 6, the visual acuity can reach 1.2.
Extended data:
Bad habits can lead to vision problems.
Watch TV and computer for a long time, play mobile phones and games, and operate continuously for more than 1 hour without interruption;
Often stay up late, lack of sleep; Incorrect reading and writing posture, eyes too close to the book, or lying in bed or reading in the car;
Reading and writing in a place with insufficient light or strong light, the desk lamp is not placed correctly; There are few outdoor activities and unbalanced nutrition every day. They often eat sweets and fast food.
The intake of fresh vegetables and fruits is too small. These bad behaviors and habits may affect children's eyesight and lead to myopia.
People's Network-How much is a child's eyesight normal?