How much vision is normal in children’s eyes is also explored depending on the age of the small child. Children’s eyesight is relatively poor when they are first born, usually with a visual acuity level of 0.1 or less, and children’s cooperation with vision checks is very low until they are 3 years old or older, when they can recognize the visual markers and cooperate with vision checks. 3-4 year old children who just have their vision checked have a visual acuity of about 0.4-0.5; 5 year old children have a visual acuity of about 0.6-0.8; 6 year old children usually have a visual acuity of about 0.8-1.0; and children over 6 years old have a visual acuity level close to 1.0. If a child’s vision level is significantly lower than this standard, or if the difference in vision between the two eyes is more than two lines, it needs to be taken seriously. It is necessary to go to the hospital for a dilated eye exam to be able to clarify the refractive power. If the corrected visual acuity is good, glasses can be worn. If the corrected visual acuity is poor and there is amblyopia, not only glasses but also standardized amblyopia treatment and training are needed.