I've been lucky when it comes to this. I have read for hours at a time on a Sony Clie all the way to today an iPod Touch and never had eye strain. Heavy reading for over 12 years and no issues. I know it happens to people and I'm glad it hasn't happened to me. I like reading on a small, backlit screen. My wife reads more than I do and she has also had no issues with LCD. Just lucky I guess.
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