A three year old child who is nearsighted needs to be remedied by developing good eye habits to prevent the myopia from continuing to grow. For myopia that has already formed, if it has a great impact on vision, glasses should be worn to correct it. Myopia is a common disease in ophthalmology, there is a trend of low age, three-year-old children may also suffer from myopia, through the optometry examination can be diagnosed, at present, the true myopia once the formation of myopia is no way to make it disappear completely through treatment, pay attention to the development of good eye habits. Children need to avoid prolonged close-distance eye use, excessive use of computers, cell phones and other electronic products, should also increase outdoor exercise, usually can effectively control the rapid growth of myopia. For myopia that has already formed, children can wear glasses to correct myopia, improve vision, and avoid the impact on normal life and learning. It is recommended that children with myopia consult a doctor in a timely manner to assess their condition and follow the doctor’s instructions for treatment.