So in this way, perhaps it's like a morse code to them. They can "talk" by shifting colors and detecting changes in the visual wavelengths... similar to how we vibrate our vocal cords at different frequencies to form words, and detect the changes in pitch with our ear drum.

Now that I've written it out, it seems silly to put "talk" in quotes. They are definitely talking. We just don't know the language. This makes me want to watch Arrival again :)

Here's the paper: https://pdfs.semanticscholar.org/17fb/c72811582e03bde433a709...

As a color blind person (as are 20% of half the population at least), I wonder if we can create glasses that mimic this shape of lens and just gradually train our brains to recognise the added spectrum.

(I know about Enchroma, but their marketing disgusts me)

Wait, if they can "see" the wavelengths - which presumably means they can differentiate between them - how is that not color vision?

Are you saying that despite the fact that their retinas are sensitive to multiple wavelengths of light, their brains throw this information away?

It's the opposite. The retinas don't have separate receptors for multiple colors, but the iris has a funky "W" shape, which amplifies the (usually undesired) chromatic aberration which is then interpreted by the brain.

'can't process colors the way we do' somehow becomes 'can't process color' .. this I think is roughly what Ned Block called The Harder Problem re consciousness

Correct but it was David Chalmers.

https://en.wikipedia.org/wiki/David_Chalmers