There is no clear correspondence between general vision and myopia, but there is still a positive correlation between the two, that is, the lower the vision the greater the risk of suffering from myopia. In general, children around 5-6 years old should have a visual acuity of 0.8-1.0, and above 6 years old should have a visual acuity of 1.0 or more. If the child’s visual acuity is significantly lower than 0.8 at this time, it means that there is an abnormality in the visual acuity, and he or she needs to go to the hospital for an optometry, especially a dilated pupil optometry to get a relatively accurate prescription. Generally about 0.8 is equivalent to about 50 degrees of myopia, it can be diagnosed as myopia, if the vision is below 0.8, may need to wear glasses to correct myopia in order to see the blackboard without affecting learning, the same vision to be corrected will not make the myopia grow too fast.