Efficacy and Influencing Factors of Repeated Low-level Red-light in Myopia

Inclusion Criteria: 1. Ages 5 to 16, gender unrestricted; 2. RLRL device usage duration of one year or more. Exclusion Criteria: * Children with obvious strabismus and amblyopia * With congenital eye disease, such as congenital cataract, congenital retinal disease * Secondary myopia (such as premature retinopathy or other eye diseases in infants and children caused secondary myopia), or myopia combined with systemic syndrome (such as Marfan syndrome) * Had internal eye surgery (such as cataract extraction, intraocular lens implantation, anti-glaucoma surgery, etc.) * Refractive medium opacity (such as corneal disease, crystal opacity, etc.) * Bnormal intraocular pressure and clinical significance (IOP \<10 mmHg or IOP \>21mmHg or binocular IOP difference ≥5mmHg) * Fundus chorioretinopathy (except for high myopia fundus degenerative changes) or other intraocular diseases * Optic nerve damage or congenital optic nerve dysfunction * Can not be regularly checked * The adjustment range is less than 8D or obvious near difficulties * Other reasons researchers think it is not suitable for inclusion in researchers