Well, I'm far-sighted. Actually I need correction at all distances. 2.75 diopters for distance and 5.25/4.75 for reading. I have no problem reading on either eink or LCD. The issue is one of brightness (intensity) and contrast. Eink is an inherently low contrast display. an LCD display can (and probably is set for) a much higher contrast. An LCD set for the same intensity and contrast as an eink display would be useless for anything else. You would not want to look at pictures on an LCD screen that had been set for comfortable reading.
LCD (and OLED) screens do not have a refresh rate, they have a frame rate. Refresh rates went out with CRT displays If an LCD screen appears to have flicker, the back light is defective.
The one area where eink is superior to LCD is power consumption. LCD displays are inefficient in that they start with full intensity and then dim all the colours that aren't wanted. If you want red, you start with white and filter out all the blue and green. I would imagine that OLED displays would have better battery life than LCD display and better contrast then any eink display.
When my Sony T3 readers die, my next reading device will be an OLED tablet.
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