I imagine E Ink screens would be pretty easy on the eyes. My phone was a little difficult to get used to at first, but then I set the background color to black and the text to grey. I also have an app called Screen Filter (Android) which lowers my screen's brightness to below the manufacturer's minimum setting. All of these combined make reading on it very pleasant. (However, in bright sunlight, I use a white background and black text with the brightness maxed out)
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