Eye strain
There is a lot of talk of eye strain in relation to reading things electronically.
It seems to me that reading text of a certain size in certain light conditions would strain the eye the same amount, regardless of whether that text is printed or electronically displayed.
One might make a convincing argument that a backlit display actually constitutes more favourable lighting conditions for reading.
I am curious, does anyone have any scientific basis for why eyes might be more strained when using an e-reader as opposed to a traditional book? I am assuming of course that the text size is more or less comparable - disregarding special applications such as large-print material for those with impaired sight.