A child with 300 degrees of myopia is usually true myopia, which usually cannot be recovered. At present, true myopia is an irreversible process, patients with true myopia usually can not be recovered, patients can wear glasses, surgery and other ways to correct myopia and improve vision. Myopia of 300 degrees is mild myopia, which can lead to vision loss and affect the normal life and study of the child. Children can wear eyeglasses, such as frames and corneal reshaping lenses, to correct their myopia and improve their vision. Children also need to develop good eye habits, avoid eye fatigue, and increase outdoor activities to control the progression of myopia and avoid developing high myopia. Children with myopia are advised to consult a doctor in time to assess their condition and follow the doctor’s instructions.