A prospective, multicenter, randomized, parallel controlled study on the prevention and control of myopia in children and adolescents by ear point pressing pills, an appropriate technique of Chinese medicine (Prophase of myopia)

INTERVENTION: Experimental group:Health education + auricular point pressing pills;Control group :Health education; CONDITION: Myopia PRIMARY OUTCOME: spherical equivalent; SECONDARY OUTCOME: Best distance vision with naked eyes;Eye axis;Corneal curvature;Adjustment range;Objective visual quality;Retinal thickness and choroidal thickness; INCLUSION CRITERIA: 1. Age: 6‐12 years old; 2. Spherical Equivalent Diopter: ?0.50D < SE <=?0.75D (myopia below 50 degrees, both eyes included); 3. Corrected visual acuity: 1.0 or better; 4. Agree to participate in the trial, and the legal guardian signs the informed consent.