Wow yourself--I said the eyestrain is from the constant focus on a plane. The headache and irritability are from the fixed positioning (or maybe the belief in a display methodology that has yet to find many adherents) At least read carefully before you disagree. It's amusing that you can dismiss any display except for e-ink prior to knowing anything about it. I read and write all day long, every day on an iMac display and I don't get eyestrain, headaches or become irritable (at least not more than normal irascibility).
Readability is a combination of many factors, some already mentioned in my first post, and also including the color of the background--is the digital "paper" equal to bleached, coated, high rag, pulp, matte, semi-gloss, glossy, recycled? What is the "white" you are comparing it to? Then how about the font--serif or san-serif? What point size? Thin stroke or medium stroke? Short or long ascenders/descenders? Open or closed counters? Cap heights vs. x-heights? Kerning, tracking, leading....column width, justified or rag right, etc. All this and more go into readability, just on the "mechanical" aspects.
On the physical side, I guarantee you'll get a migraine after an hour reading Chaucer in the original English, no matter what you're reading it on.
Don't confer a champ before everyone is in the ring.
