I also use font size 4 on my Kindle. I'm not really sure how far I keep it from my face. Offhand I'd say about a foot. Maybe a bit more. I'm not sure.
I think the number 4 is just an index. It's the 4th font on the list.
Amazon may have changed the font sizes at some point but I still use size 4. I used to read at size 3 till I tried 4. I'm still comfortable with 3. I just like 4 better. Anyway if it got a little smaller I might not have noticed. Probably that's true if it got a little bigger.
Barry
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