Double Helix Design Defocus Lens Spectacle (RACE) for Myopia Control

Inclusion Criteria:

1. Race: Chinese children and adolescents.
2. Age 6-13 years, gender unrestricted.
3. Cycloplegic refraction SER: -0.75DS~-5.0DS in both eyes.
4. Best corrected visual acuity of both eyes reaches 1.0 (0.00 logMAR 6/6).
5. Refractive astigmatism and astigmatism are no more than 1.5D.
6. During the study period, willing to wear glasses provided by the researcher only (>10hours) and without additional interventions.
7. Willing to be randomly assigned.
8. Able to sign an informed consent form with the accompaniment and understanding ofparents or guardians.

Exclusion Criteria:

1. Allergic or intolerant to medications used for ciliary muscle paralysis.
2. Received any nearsightedness treatment such as atropine, rigid gas permeable contactlens, bifocal/progressive lens, red light therapy, or acupuncture within 30 daysbefore the study.
3. Received defocus lenses for nearsightedness treatment in the past.
4. Diagnosed with any eye disease other than nearsightedness, including strabismus (esotropia greater than 8 prism diopters or exotropia greater than 12 prism diopters),corneal diseases, conjunctival or eyelid damage or other conditions (such askeratoconus, herpes simplex keratitis, etc.).
5. History of eye surgery (including strabismus correction surgery).
6. Eye or systemic diseases that might be associated with nearsightedness or itsprogression, such as Marfan syndrome, retinopathy of prematurity, diabetes, etc.
7. Anatomical or dermatological factors that may interfere with the wearing of spectacleframes.
8. Other reasons that the researcher deems inappropriate for the participant to beincluded in the study, such as excessively high expectations for the effectiveness ofdefocus lenses, or plans to use other nearsightedness intervention strategiessimultaneously with the study.