> But it tends to not be about the "closeness" AFIK. I've seen studies explaining their findings as the muscles getting used to only focusing near, as a sort o

> But it tends to not be about the "closeness" AFIK. I've seen studies explaining their findings as the muscles getting used to only focusing near, as a sort of range of motion thing. One study grouped kids based on the amount of time spent outdoors vs indoors (as a rough proxy of focusing on distant vs only on near things) and showed a statistical difference in myopia rates between the groups.