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There was a study that followed Chinese kids who stayed in China vs Chinese kids who moved to Australia. There was a marked difference.

Not sure if its about sunlight or near/far focus though.

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They can test this if they tried getting students to try studying outside under natural lighting for a while. Though in China that may be impractical depending on the city.

They tested having students study in a sunlit classroom. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5536284/

> Not sure if its about sunlight or near/far focus though.

I have seen some suggestion that it is a combination of both. Either is plausible though.

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