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Nothing like opening opening a can of worms. Every device can cause eye strain, even a book, because the cause is reading position, lighting, and intensity of concentration. Ask an eye specialist. That is the conclusion of the research I looked into about the issue. All other opinions are purely subjective based on reader experience. The real issue, I believe is that book reading devices can not do all reading tasks equally. It is obvious to me that e-ink readers like the Kindle and Nook are best for reading text and are the best substitute for the typical book. However if you are reading anything with illustrations, newspapers, magazines, textbooks, picture books, etc, an LCD screen based device like the iPad is better. So the conclusion? Own both if you can afford it but don't toss out your paper based books which is still the best 'device' for reading. What I intend to do is buy both an e-ink reader and an iPad.
BTW, I am 68 years old and an avid reader, perhaps a lot more than the average joe because it was a requirement of my professional life for over 30 years.
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