A child’s visual acuity of 0.25 suggests that there has been a significant loss of vision, and he or she should actively seek medical attention to identify the cause. Check myopia should first do dilated optometry, children under 12 years of age is best to use ciliary muscle paralyzer dilated optometry, 12 ~ 35 years of age can be considered to use rapid dilated optometry. Only after the pupil dilation, the optometry can get a more accurate refraction. In order to prevent the development of myopia in children from seven to ten years old, you can seek medical advice and wear corneal plastic lenses at night, corneal plastic lenses can also protect the stability of vision to a certain extent. Low concentrations of atropine eye drops can also be used. The use of appropriate eyeglasses, keratoplasty lenses, and the use of low concentration atropine need to be under the supervision of a doctor.