Comment by outworlder

> I bring this up because one of the largest factors in myopia development appears to be outdoor light exposure in childhood.

I used to live almost on the equator. Before adolescence, I would spent most of my time outdoors. Very stable weather so windows were open most of the day (and night). There was often direct sunlight even indoors. We would go to the beach every weekend. I ended up with -5.00 and -5.25

Maybe this would decrease the prevalence, if you are looking at the entire population. But it's not like you, as an individual, will be immune if you just stay outside.