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What are the main factors that have been reasonably established to affect myopia?

For example, here is a study which shows that children who spend a lot of time outside have far better eyesight than those who do not:

RESULTS: The prevalence of myopia in 6- and 7-year-old children of Chinese ethnicity was significantly lower in Sydney (3.3%) than in Singapore (29.1%) (P < .001). Children in Sydney spent more time on outdoor activities (13.75 vs 3.05 hours per week; P < .001), which was the most significant factor.

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