As one meta-analysis put it:

It’s estimated that an increase of one hour per day of outdoor time could reduce the occurrence of myopia in children by 45%.

Make sure your kids spend time outside, folks!

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[–] 1 point 5 months ago*

There have been RCTs conducted for this. For example

Myopia Prevention and Outdoor Light Intensity in a School-Based Cluster Randomized Trial

Pei-Chang Wu et al. Ophthalmology. 2018 Aug.

In this study, schools were selected and promoted either outdoor or indoor recess

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