Outdoor activities are very common in Norway winter and summer. The skies are often quite clear too.

And, at least where I live, kindergartens have the children playing outside most of the time, summer and winter, rain or shine.

My impression is that short-sightedness is in fact rarer in Norway than in the UK but it's not something I actually have statistics for.

I fear that it might be changing now as so many children, boys in particular, spend so much time using computers.