Reading on a tablet can be harder on the eyes than on a dedicated ereader - mostly based on the technical specs (refresh rate, pixels per inch, glare free screen, etc.). The ereader IS different than an LCD screen. A dedicated ereader is designed for reading at close range with screen graphics that do not cause you to squint, and includes a non-glare surface.
This is why some people can read on an LCD screen and others can't. If the pixels per inch is not equal to what you'd find in a Kindle Paperwhite (et al) and if there is screen glare, you may find it hard to read for long periods on a tablet. Adding an anti-glare screen protector to a tablet can help - but then if you also watch movies on the same device your don't get the best benefits of the LCD screen.
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