There is no optimal period of time to correct myopia in children. After finding out that your child is nearsighted, you should consult a hospital as soon as possible and have it corrected to improve your vision. Myopia in children is usually caused by a combination of genetic factors and bad eye habits. Genetic factors cannot be changed, but good eye habits can prevent myopia from increasing. If a child has already developed myopia, myopia can be corrected with prescription lenses to improve vision. If myopia is not corrected in time, amblyopia or myopia progression may occur. Children also need to develop good eye habits, avoid eye fatigue, reduce the use of cell phones, computers and other electronic products, and increase the time of outdoor activities to avoid myopia progression to high myopia. It is recommended that children with myopia should consult a doctor in time to assess their condition and follow the doctor’s instructions for treatment.