If a child under 6 years old has a visual acuity of 0.7, it may be normal and requires no special treatment. If the visual acuity of children aged 6 and above is 0.7, which is obviously lower than the normal value, if it is caused by myopia, it is necessary to wear glasses to correct the visual acuity, and if it is caused by eye diseases, it is necessary to be treated by surgery or other methods. 1. Myopia: Visual acuity refers to the ability of the retina to distinguish images. 0.7 visual acuity in children aged 6 years and above is a mild form of low vision, which needs to be examined by an optometrist in a regular hospital, and if it is diagnosed to be true myopia, it needs to be corrected and treated through the wearing of eyeglasses. 2. Eye diseases: such as mosquito, is due to vitreous liquefaction and detachment, when the vitreous turbidity is not absorbed for a long time, accompanied by vitreous mechanization, pulling the retina caused by retinal detachment, serious damage to the vision, the feasibility of vitreous cutting surgery. If the children’s visual acuity of 0.7 persists without relief, they need to seek medical treatment in a timely manner, and it is important to minimize the adverse effects on their vision through “early detection, early diagnosis, and early intervention” to avoid the further deepening of myopia.