To evaluate the efficacy and safety of 650nm low-level red-light irradiation for myopia control and prevention in children under less restrictive conditions than randomized controlled trials. Participants included children(aged 7 to 18 years, spherical equivalent error of 0.5D or below) who are already myopic at recruitment, and those who are of Emmetropia or low hyperopia.
This multicenter real world study will be conducted in at least 100 hospitals: Beijing Tongren Hospital will be the initiator of the study, other hospitals such as the Capital Institute of Pediatrics will serve as sub-centers. The whole study will last for three years.The investigators will perform data analysis at 6 months follow-up, one-year follow-up, and two-year follow-up. Participants who used 650 nm low-level red-light would be recruited. This kind of intervention will be integrated into a headworn device. This device could be used for treatment of myopia or amblyopia, and is safe for the eyes and has been verified by the Chinese market supervision and administration department.
Study Type
OBSERVATIONAL
Enrollment
2,000
Typically, children who uses the 650 nm low-level red-light will be recruited into this study. The use of any other myopia intervention is not restricted except for low concentrations of atropine. Because atropine will cause pupils dilated, the amount of light entering the eye can not be controlled, and red-light is a laser, to be safe, we need to take certain consideration of the amount of light-entering. Participants receive the 650 nm low-level red-light intervention not because they are enrolled in a study, they would receive the intervention in the same manner and intensity if they were not enrolled in the study.
Red light
Beijing, Beijing Municipality, China
RECRUITINGChange in axial length
Use an optical biometer to measure the axial length
Time frame: Baseline, six-month follow-up, one-year follow-up, two-year follow-up
Change in spherical equivalent error
Children's pupil were dilated using Mydrin-P eye drops, and then the refractive error was measured using an autorefractor. the two measurements (axial length and spherical equivalent error) will be aggregated to arrive at one reported value through the following way: axial enlongation will be defined as progress in myopia, decrease in spherical equivalent error will be defined as progress in myopia too.
Time frame: Baseline, six-month follow-up, one-year follow-up, two-year follow-up
Change in Choroid thickness to measure
Use an enhanced-depth imaging technique (based on Optical coherence tomography )
Time frame: Baseline, six-month follow-up, one-year follow-up, two-year follow-up
Change in steep keratometry
Use an optical biometer to measure
Time frame: Baseline, six-month follow-up, one-year follow-up, two-year follow-up
Change in flat keratometry
Use an optical biometer to measure
Time frame: Baseline, six-month follow-up, one-year follow-up, two-year follow-up
Change in length thickness
Use an optical biometer to measure
Time frame: Baseline, six-month follow-up, one-year follow-up, two-year follow-up
Change in anterior chamber depth
Use an optical biometer to measure
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Time frame: Baseline, six-month follow-up, one-year follow-up, two-year follow-up
Change in central corneal thickness
Use an optical biometer to measure
Time frame: Baseline, six-month follow-up, one-year follow-up, two-year follow-up