Eliminating doubts of time outdoors as a significant intervention to reduce the prevalence of myopia

We thank Dr.Li Deng et al.and Dr.Enis Kocak et al.for their comments on our previous study of outdoor time and myopia development.Clearly,as noted in Dr.Li Deng et al.’s paper,we did not measure the academic performance of subjects or near work time in the trial.Though these are important confounders of myopia,their effect may be considerably reduced by randomization in the