Really, it depends on your eyesight and how long you are reading. Until my vision worsened, I was able to read off an Itouch for at most an hour. Now it's about 6 minutes. I'm getting an Iphone 8 or 8 Plus. The 8 has a screen that is about 3/4 inch larger, while the plus is over an inch larger. So, I have to decide since the Plus is also less portable. I doubt it will fit in my pocket for instance (I only have it in my pocket when at home; otherwise it's in my purse). However, the larger screen will make it possible for me to read again when I'm out and about.
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