There is a distinction between near vision and distance vision, and what is generally referred to as “normal vision” refers to 1.0 vision as measured by the International Standardized Visual Acuity Scale. However, the assessment criteria for normal vision are slightly different for adults and children of a certain age. For minors, because children are in the developmental stage, especially for newborns, the standard of normal visual acuity is different depending on their age and months of age. The vision of children aged 9-12 months is 0.10-0.15, the standard vision of 1-year-old children is 0.20-0.25, the vision of 2-year-old children can reach about 0.5, the vision of 3-year-old children can reach about 0.7, 4-year-old children can reach 0.8, and the vision of 5-year-old children can basically reach the human level of about 1.0. The standard normal visual acuity for adults is 1.0. However, the measurement of children’s visual acuity often requires consideration of the child’s cooperation, and adult visual acuity testing also requires consideration of their visual fatigue and the light conditions in the environment, so the control of visual acuity indicators in clinical work also requires multiple considerations.