Nearsightedness and astigmatism are so common that I doubt they alone are the cause. I'm nearsighted with astigmatism. I read without my glasses and typically hold reading material about a foot from my face. I like a really small font.
I remember in one of our past LCD vs e-ink discussions one person reported he/she was extremely nearsighted and held a phone or tablet at about 6 inches with no problem.
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