If you are squinting because the text is too small, at least in firefox you can increase the text size with CTRL+
I find that the dark style looks best with increased text size, however that's mostly because of my monitor resolution (1920x1200) so I am hesitant to increase the global size variables.
As for spring, some things are broken with it (e.g. look at someone's profile page and then compare it with another style)