The evidence around this appears to be most strong for actually having a long focal distance as being one of the most important factors (as opposed to the lux) - unless the evidence has significantly changed.
I mean there’s probably a pretty strong correlation between being outside and having a long focal distance, but my understanding was that when attempting to control for this (ie rise of increase in apartment living, first in Japan and then other Asian cities) its tightly correlated to not focusing on things a long way away
