laur5446 hpst Riva
As being rink the only screen I can look at, I am a very experienced user. I use Onyx eReaders since some years and never had a problem with eyestrain, and they have had android, which saved my life. But recently I bought a eink phone with android 9, and this makes me dizzy even with the light turned off, so its possible the problem is with android 9.
My older onyx had android 4 and 4.4, and the one I am using right now have android 6 (8" of screen). I really want to test the newer models with android 9 but I am afraid it can appear dizzynes with that android version.
If Onyx keeps its word of upgrading my actual eReader to android 9 we will have a very valuable information about eyestrain related to android version
So for now, I can say android 4, 6 and 7 (the one in my eink phone) on an eReader are a solution for me