Many e-book reader programs (at least on Android) like Cool Reader or FFBReader offer the "Night" reading mode - basically, reverting from usual dark-text-on-light-background to light-text-on-dark-background.
Are there any studies showing whether there are benefits or downsides to one's eye health when reading books in "night mode" vs "normal mode" at night (low light) or during day (plenty of light)?
Ideally it would cover different display types, but personally I'm especially interested in ~5" LCD and AMOLED displays as on recent flagship Android smartphones.