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Neat, but this completely ignores the real reason people have trouble with small fonts: bad eyesight. The size the font needs to be is a factor of distance and eyesight. The real solution is to just use the default font size and have users adjust that to their preferences.

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> The size the font needs to be is a factor of distance and eyesight.

And the PPI of the monitor/viewing device.

and the ambient light conditions, the amount of sleep someone has had, color blindness (could be classified as bad eyesight), the actual size of the screen (for scrolling/line length), the font itself, the amount of experience the reader has with the latin script, the quality of font hinting, the quality of sub-pixel rendering, the quality of kerning.

I wonder if, with a good enough camera, you could detect people with non-ideal vision by watching their eyes and "anti-blur" the screen in such a way that it's perfectly in focus for their eyes and head position?

This is a really interesting thought! It's something that probably wasn't viable before the advent of High-DPI displays. Making it worth the effort in a real-world (rather than lab-based) setting is probably insanely difficult though.

That only works if your screen can produce a lightfield. Maybe future 3D screens will have such a feature.

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