There are lower limits of vision standards for each age group of children. As long as the lower limit is reached and above, it is considered normal. It is generally recognized that the lower limit of vision is 0.5 for 3-year-olds, 0.6-0.7 for 4-5-year-olds, 0.7-0.8 for 6-year-olds, and 1.0 for 7-year-olds and above. If the results of the examination do not reach the lower limit of vision that should be present at this age, it may indicate that there is a problem with the development of the child’s eyesight, and a comprehensive ophthalmologic examination is needed at this time. In daily life, children should pay attention to eye hygiene and maintain 2-3 hours of outdoor activities every day to facilitate the development of their eyes. Do not overuse the eyes, ensure adequate sleep, eat a comprehensive diet, eat less spicy and stimulating food, eat more fruits and vegetables, wear sunglasses when going out in the strong sunlight, to reduce bright light stimulation, to maintain eye health.