Myopia is a major public health problem globally, including in China, which is reported to have one of the highest prevalence rates in children and adolescents.1 Of the many strategies to prevent the development of myopia and to slow its progression, repeated lowlevel red light (RLRL) has emerged as a popular yet controversial option.2 RLRL is a nonpharmaceutical treatment for children, involving exposing the retina to a red light laser (635-650 nm) for a few minutes, typically twice a day for 5 to 7 days per week. This therapy has gained popularity and widespread use rapidly in China over the past few years.