All data are shown as the mean ± SD. A 1-way ANOVA was used to compare the mean values of SE, AL, and CCR of the same-side eyes among the four subgroups at baseline (week 0). Comparisons of mean values of the parameters of right eyes with left eyes in the four subgroups were checked with paired t-tests. Two-way repeated measures ANOVA was applied to compare the mean SE, AL, and CCR among the high and normal light subgroups across time. Least Significant Difference (LSD) correction was used for post hoc analysis to found differences of the refraction and ocular biometric parameters between HL and NL subgroups at each measurement time-point, and to find the differences among the four time points. There were no differences in SE, AL, or CCR between right and left eyes in HL+NV and NL+NV subgroups among the four time points (paired t-tests, P < 0.05). Therefore, data from the right eyes in HL+NV and NL+NV groups were shown in the current study. All statistical analyses were performed with SPSS 22.0 (SPSS, Inc.; IBM Corp., Chicago, IL, USA). Values of P < 0.05 were considered statistically significant, and values of P < 0.01 were considered highly significant.