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It may also have to do with how long you read at a time. I can read on my smartphone for short periods of time, but ran into problems when I tried to read on it for a few hours in the same day (eyestrain, itchy eyes, weird halos around lights the next day, as well as poor focus). This was using the Overdrive app set on sepia at the lowest brightness I could manage.
The phone is handy if I want to read while waiting for a dentist appointment, but I stick with my eink reader if I am going to read uninterrupted for a long period of time. I have never had any eye issues with my eink reader even after binge-reading all day on a Saturday.
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