Discussion on:

How to print high-res images the size of a human hair

Cool printer. But the usual resolutions I see are 600 dpi. That is a long way from 10,000 and only a factor of 10 from the incredible 100,000. I suspect a mis-print.

None of the potential uses listed would be visible to the naked eye, so don't think this will have any impact on what we can actually see unaided. Might be a way to frustrate currency counterfeiting, though, although you'd need a special device to detect the watermark.