Clinical randomized controlled trial of progressive addition lenses on the control of myopia in Chinese adolescents

INTERVENTION: Group 2:Use routine single lens as control;Group 1:Gradually focal lens; CONDITION: Myopia PRIMARY OUTCOME: Myopic degree;Eyeball bio‐test; INCLUSION CRITERIA: Computer optometry after cycloplegia, binocular myopia, the spherical equivalent degree between ‐0.75 ‐3.00D, astigmatism degree less than ‐1.50 D, binocular anisometropic degree less than 1.00D; Bilateral corrected visual acuity more than 1.0; Normal intraocular pressure: binocular intraocular pressure less than 21mmHg, and the difference less than 2mmHg; No history of wearing contact lenses, bifocal or multifocal lenses; Term infants, birth‐weight more than 1250g; Agree to wear the lenses and follow up more than 2 years; Understand the study objective and accept the randomized allocation.