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LCD & OLED do not damage eyes. Nor did TV CRTs. The bluer light of LEDs (OLED screen or LED backlight) might just keep some people more wakeful at night. There is some evidence that high UV (from the sun) might gradually affect the eyes. Sunglasses with proper UV filters are recommended.
The eink is more relaxing to read if your ambient light is good enough.
Colour eink would inherently need LED front lighting or very bright ambient light. It would also be lower resolution than the maximum possible monochrome screen, the same is true of OLED, LCD and CRT.
There has been a big thread on this.
Also the majority of B&W text only ebooks are read on phone/tablet/LCD/OLED and always have been.
I'm happy to use a 10" Tablet for PDFs and a Tablet or Laptop where I need colour. I'm not going to sit and read anything other than a text novel for more than a few hours. I might read a novel for 4, 6 to 8 hours, almost solid on eInk, using a good light, not the front light. I have Kindle PW3, Kobo Aura H2O original and Kobo Libra H2O with front lights.
I might read on my phone while waiting for a take-out.
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