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(I belive) Backlight affect adversely your eyes because of the type of a lamp that is being used to make this backlight, the lamp is flickering, even if you don't see it it is. This is why I believe any backlight in LCD type of a screen is not very healthy for your eyes.
You have given a nice comparison about walking/getting old, however I feel a HUGE difference if I compare what I feel today when I read from a very good LCD in a very well lit rooms and when I read from eInk device. Frankly speaking I cannot even compare those two.
Frankly speaking at the end of the day, who cares why? The end result, is that reading from any type of the computer screen tyres me and reading eInk device doesn't. Although even laptop LCD was a big improvement on a good CRT with refresh rate 120Hz.
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