Of course there are going to be a lot of people over age 40 who have no problem whatsoever with LCD screens.
What I was wondering, though, was what was the percentage of their research involved people who are over 40? Or are they even giving any importance to that market?
I developed cataracts at an earlier-than-usual age due to medication side effects and have artificial lenses in both eyes, and I can speak for myself when I say that yes, I can be on the computer for hours at a time, but as time passes I do notice a marked decrease in the sharpness of my vision, to the point where I just finally shut the computer down. I hear my friends complaining about how they just can't stare at the computer screen like they used to without their eyes bothering them.
I don't have a problem with tired eyes when reading either my reflective LCD reader or my e-ink one. So for me, the reading experience on those devices and on an LCD computer monitor are totally different.