A total of 100 teenagers , between seven and 12 years of age , with mild-to-moderate myopia and spherical lenses < -6.00 D and cylindrical lenses < -1.50 D will be selected from the Xinjiang Uygur Autonomous Region Institute of Traditional Chinese Medicine , a grade III level A teaching hospital in Urumqi , Xinjiang , China ( Xinjiang Medical University Affiliated Hospital of Traditional Medicine ) .