I've had trouble reading paper books for ages. That's why I was so excited to get my hands on a Kindle 1, even at $400. It meant I could read without eyestrain again!
A friend recently offered to loan me a copy of one of Bill O'Reilly's books (definitely not on my reading list). I was able to politely beg off with "Thanks, but I can't read paper books any more. My eyes are too bad."