[LlamaTrauma]

This is super cool, I've wondered if this wort of thing could be possible and I guess it is. The applications given are funny though. I can't think of any applications either, but "helping people with color-blindness" reads like the ol' search and rescue excuse [1]. I think they're talking about shifting colors around so less color is perceived in the wavelengths they can't see?

[1] https://xkcd.com/2128/

[wkat4242]

It's pretty nifty though because besides changing the wavelength it must also preserve the exact direction of each photon. Without the correct light field you'd see nothing.