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On the monitor I mentioned, this text is about 15-20 pixels tall mostly-white on mostly-black, and I can read it from ~4 feet away.

(website says that is ~186 PPD)

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That makes sense. Given that the smallest legible fonts are around 5 pixels tall, that's 3-4x less PPD than your monitor offers at 4 feet, so you'd need ~46-62 PPD eyesight to be able to read the text. 20/20 at 60 would be more than sufficient.

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