Until the ideal pharmacological targets being found, we believe that manipulating light environment is the most practical way to prevent myopia. Although whether there is a threshold of daily outdoor light exposure for preventing myopia is still under debate,96,97 evidence has shown that less than 40 min per day of outdoor light exposure may be a risk factor to faster axial eye growth in children.96 Generally, approximately 2 hours of outdoor light exposure per day is recommended.96,98 There is a lack of concordance between areas with short hours of sunlight and areas of high myopia prevalence.99,100 Therefore, more data are required to prove the VL hypothesis described above. Currently, we have started a clinical trial to test the effect of artificial VL source on preventing myopia in human. We hope our research on VL could extend the potential and feasibility of using light environment to prevent myopia.
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