As someone else said, it depends on the time of day and how tired I am. If my eyes aren't tired and the lighting is good, I can use size 5 with no glasses. With my glasses, I can read on size 3, but I'm more comfortable on size 4. When reading in bed at night without my glasses, the smallest I can go is 6, and sometimes 7.
One of my favorite things about my Kindle is that I can always read on it, with or without my glasses, and no matter what the time of day or light level is.
Shari
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