Different ages have different standards

Usually speaking, vision refers to the minimum divisible vision of the eye rather than the minimum visible vision, so the eye chart reflects the two points at which the subject is looking at the target. The separated minimum visual angle, that is, the minimum divisible visual acuity or 1 visual angle of vision, can represent the best visual function of the subject.

When a child is 1 month old, his visual acuity is light perception; when he is 3 months old, it is 0.02, which means he can track moving objects in front of him; when he is 1 year old, it is 0.2; when he is 2 years old, it is 0.4; when he is 3 years old, it is 0.6 , that is, you can understand the visual acuity chart, and you can use the visual acuity chart to check your vision; it is 0.8 at the age of 4; it can reach 1.0 at the age of 5, which is the adult visual acuity. If it cannot be reached, you should go to the hospital for examination as soon as possible; it can be reached at the age of 6 1.2 vision.

Extended information:

Bad habits can cause vision problems

Watching TV or computers for a long time, playing mobile phones, playing games, operating continuously for more than 1 hour, no Rest in between;

Often stay up late, lack of sleep; incorrect reading and writing postures, eyes too close to the book, or reading in bed or in a car;

Under insufficient light or light Reading and writing in intense places, placing desk lamps in incorrect positions; having few outdoor activities every day, unbalanced nutrition, and often eating sweets and fast food

Intake of too few fresh vegetables and fruits, etc., are some of these bad behaviors Children's vision and habits may affect children's vision and lead to myopia.

People's Daily Online - How much is a child's vision normal?