Quote:
Originally Posted by HarryT
I'm just curious, as a scientist, what the mechanism is that produces eye-strain in those circumstances.
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I can think of three reasons (there may be others), in order of likely relevance:
- Backlight: the light is directly projected into one's eyes, not first reflected from the ambiant light. There may be underlying mechanisms, which could better explain the eye-strain:
- The spectrum of the backlight is not at all the same as the one that is reflected on e-paper.
- The illuminance do not adjust naturally (it may adjust automatically with a sensor... that's far from perfect).
- Refresh-rate: although LCD are far better than CRT in this regard, there are still flickers, even if they aren't consciously visible.
- Reflections: caused by glossy screens. Again, may be unconsciously, the eyes (or the brain) have to permanently focus on the correct image (the one on the screen, or the one that is reflected).
Some further readings, e.g., on Wikipedia:
Asthenopia
Electronic paper (see the 2nd §)
Glossy display (see
Disadvantages and
Adverse health effects)
Matt vs. glossy screens
Last but not least: as an analogy for what concerns the first point, one could think of the difference between television and cinema (or projection screens).