After six weeks of age, children and adults reach the same visual acuity, the normal standard visual acuity in 1.0. so eleven-year-old children, the standard visual acuity should reach 1.0, but eleven years old in the school age, and is the growth and development period, easy to appear visual fatigue, many children gradually vision loss, consider the possibility of myopia. This situation requires a routine examination in the ophthalmology department, especially for optometry. If other diseases of the eye are ruled out, and there are degrees after dilated eye examinations, consider the need for glasses and anti-fatigue treatment at the same time, otherwise the degree of myopia will develop further.