The development of eye vision is a process of gradual improvement, so the standard vision is different for children of different ages. It is generally believed that the naked eye vision of children around three years old should be between 0.4-0.5, four years old between 0.5-0.6, six years old when the naked eye vision can reach about 0.8, and eight years old when they develop to the state of adults to reach 1.0, which is the normal vision development of children This is the normal visual development of children. If, after a vision test, a child’s vision is not in the normal range, such as below normal, it means that the child may have some eye disease. The most common ones include refractive error or amblyopia, which require further examination to clarify the specific cause and active treatment to avoid further aggravation of the condition and greater impact.