Effects of 650nm Low Energy Light on Human Retina and Choroid Microcirculation

Inclusion Criteria: 1. Age from 7 to 17 years old or from 18 to 45 years old; 2. Meet the diagnostic criteria for patients with simple low or moderate myopia, with diopter \< -6.0d and eye axis \< 26.0mm; 3. Transparent refractive stroma, no other eye diseases except nearsightedness; 4. Agree to participate in the clinical study and sign the informed consent. Exclusion Criteria: 1. Other ocular lesions, such as uveitis, retinal/choroidal vascular lesions, congenital ocular lesions, glaucoma, high myopia (ocular axis \> 26cm), degenerative retinal disease, optic neuropathy, etc.; 2. Another eye with low vision 3. Corneal edema/epithelial detachment, corneal opacity; 4. Redness, pain, dry eye, photophobia, difficulty in opening eyes; 5. Had a history of eye surgery in recent 3 months; 6. Severe impairment of liver and kidney function and/or serious systemic diseases (such as cardiovascular, respiratory, digestive, nervous, endocrine, genitourinary, etc.); 7. Women who are already pregnant, preparing for pregnancy during the study period and lactating; 8. A history of substance abuse or alcohol abuse; 9. Receiving prevention and control treatment for myopia other than glasses within the first 30 days; 10. Any situation in which the study physician believes that the patient's condition will interfere with the clinical study (e.g., the patient is prone to nervous tension, uncontrollable emotions, depression, etc.)