Efficacy of Multi-Type Photolithography Flat Microstructure Lenses for Childhood Myopia Control

Comparative Efficacy and Safety of Multi-Type Photolithography Flat Microstructure Spectacle Lenses Versus Spectacle Lenses With Aspherical Lenslets for Myopia Control in Chinese Children: A 12-Month Randomized Controlled Trial

The goal of this clinical trial is to learn if photolithographic flat microstructure lenses work to prevent myopia in children. It will also learn about the safety of different designs of photolithographic flat microstructure lenses. The main questions it aims to answer are:

Are photolithography flat microstructure lenses effective and safe in preventing myopia in children? Does the depth of tinted lenses affect visual quality? Researchers will compare photolithography flat microstructure lenses to a spectacle lenses with aspherical lenslets to see if photolithography flat microstructure lenses works to prevent myopia in children.

Participants will:

Wear photolithography flat microstructure lenses or Spectacle Lenses with Aspherical Lenslets more than 8H per day for 1 year.

Visit the clinic once every 3 months for checkups and tests.

Inclusion Criteria:

1. Age: 6 years ≤ age ≤ 8 years (calculated based on the informed consent date);
2. The spherical equivalent (SE) of both eyes is 0D to +1.00D (inclusive of boundary values) after cycloplegia;
3. Astigmatism: Cylindrical power of both eyes ≤ 1.00D;
4. Anisometropia: Difference in spherical equivalent between both eyes ≤ 1.00D;
5. Corrected visual acuity: Best corrected visual acuity (BCVA) of both eyes ≥ 1.0 (decimal notation, 5m);
6. General health status: No systemic syndromes that affect ocular development; no long-term use of growth hormone, corticosteroids, or antiepileptic drugs;
7. Previous intervention: No use of any myopia control methods within the past 3 months, including but not limited to: multifocal glasses, atropine eye drops, red light therapy, acupuncture, etc.
8. Compliance with spectacle wear: Parents ensure that the child wears glasses for ≥8 hours per day;
9. Follow-up capability: Ability to attend scheduled follow-ups for 12 months (4 visits in total);
10. Informed consent from guardian: Legal guardian signs the informed consent form; children also sign the assent form.

Exclusion Criteria:

1. History or presence of glaucoma, corneal disease, or other ocular organic disease, or acute or chronic ocular inflammation;
2. Combined with systemic major diseases, mental diseases, or systemic collagen metabolism diseases;
3. Used any myopia intervention drugs or devices in the past 3 months;
4. Those who have participated in other similar clinical studies in the past 3 months;
5. Diagnosis of amblyopia, constant strabismus, and other congenital eye diseases;
6. Those who are allergic to the lens material or products related to the study;
7. Allergy to mydriatic agents and related ophthalmic medications;
8. Allergic to photochromic materials or related dyes; taking photosensitizing drugs; suffering from photo-induced skin or neurological disorders;
9. Unable to understand the study content or unable to cooperate with the follow-up;
10. Other reasons why the research doctor believes the patient is not suitable for the study.