I have high myopia and I had plenty of outdoor time in my childhood on par or even higher than my buddies who did not developed myopia. Less anecdotal evidence

I have high myopia and I had plenty of outdoor time in my childhood on par or even higher than my buddies who did not developed myopia. Less anecdotal evidence is prevalence of myopia in south-east Asia where people have more exposure to bright sun than in Europe. My pet hypothesis about myopia is exposure to high glycemic food like white rice or white bread that simulate growth just little bit too much that is enough to develop the eye few microns too big and cause myopia. But that hypothesis also has a lot of issues.