I can literally stare into the thing for hours: reading books/articles, surfing, watching video. It's makes no further strain on my eyes than does an LCD monitor (though, full disclosure: I use a P-MVA screen, which is supposedly "better quality" as LCDs go), and I _have_ to look at that for hours a day for my work.
I think the people who don't like looking at the iPad screen for more than a few minutes base their patterns on personal or ideological beliefs, or are personally invested in another platform like OLED or e-ink (i.e., fanboys).
I think the people who don't like looking at the iPad screen for more than a few minutes base their patterns on personal or ideological beliefs, or are personally invested in another platform like OLED or e-ink (i.e., fanboys).