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Same goes for myopia and crooked teeth.

I've asked my optometrists and orthodontists what cause these problems and just got shrugs and big bills.

Academic research seems pretty confident now (in the last few years) that myopia is mostly caused by lack of exposure to daylight when very young.

My impression (from briefly skimming papers about this a few years ago) was that there is clear evidence that myopia is strongly related to not spending enough time outside as a child, but it’s not clear to what extent the effect being outside has on eye development is from focusing the eyes far away vs. being in very bright surroundings.

I believe that someone did some studies involving outdoor schools or similar, that was considered to differentiate between those factors - being outdoors and reading was better than being indoors and reading.

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