[Wintamute]

I don't know about the effects of the backlight, but there are lenses in-between your eyes and the actual display surface which allow your eyes to focus at infinity. So it isn't as if it forces your eyes to strain to focus at something an inch or so away. I think its pretty safe to say that they're not pouring millions of dollars into R&D for a system that gives you double vision and eye strain :)