Quote:
Originally Posted by guma
If it actually is this brightness-differential between screen and environments that causes eyestrain it should not matter whether an offending display is front- or back-lit.
|
It shouldn't, except the light that comes out of an LCD display has been polarized so most has the same polarity. Polarized light by itself
can cause eyestrain:
http://sunglasses.lifetips.com/cat/6...ses/index.html
Quote:
|
When light is reflected off a smooth surface like a flat road or water, it becomes polarized horizontally. The polarized light can cause eyestrain and fatigue.
|
With frontlights, the lightguide diffuses the LED light which then reflects off the eink screen. The light coming out of the screen may or not be polarized. (I haven't seen anything stating either.) So there may in fact be a difference in polarization. (Easy to test: somebody with polarized glasses and a Nook Glow or KPW out there?)
Normally, polarized lenses are a *great* thing; I use them outdoors myself.
But I'm not sensitive to LCD eyestrain.
Others, however?
It is like CRT refresh-rate and fluorescent-light eyestrain; some people are more sensitive than others. And some people are more sensitive to polarized light eyestrain.
Nothing is ever as simple as it appears at "first glance".
