Fair point. Would another fair avenue to potentially counterpoint be to ask why countries with less light for long periods, such as Nordic countries, or areas

Fair point. Would another fair avenue to potentially counterpoint be to ask why countries with less light for long periods, such as Nordic countries, or areas where people spend months at a time indoors like frigid areas, are not more nearsighted than fairweather areas like Singapore? Unrelated, I'm wondering if there is some method to tell. The general fact is, people indoors tend to be focusing on things close by. And vice versa outside. So it feels impossible to conclude without controlling for the other. Can we find people who read or smartphone for hours on end outdoors? Or people indoors who don't do those things?