Currently it is normal for a child of 8 years of age to have a visual acuity of 5.0 in the naked eye, and the normal visual acuity for the average adult is 5.0 as well as 5.0 and above. Visual acuity refers to the ability of the retina to distinguish images, and children with myopia, cataracts and other eye diseases may experience vision loss. Children need to develop good eye habits, avoid prolonged near eye use, and improve their lifestyle to ensure adequate sleep. During the diet should maintain nutritional balance, eat more carrots, cabbage, animal liver and other foods containing vitamin A, can better protect the eyesight, at the same time more than 8 years old children should pay attention to maintain a balanced diet. Children usually pay attention to eye hygiene, can prevent myopia, more outdoor sports, less reading electronic products, and books to keep a distance, see some green plants. It is recommended that children with vision loss should consult a doctor in time to assess their condition and follow the doctor’s instructions for treatment.