They've already managed to use CRISPR to give color blind primates their full vision back...

http://www.neitzvision.com/research/gene-therapy/

Reminds me of some filler-dialogue from the game Deus Ex (2000), where a late-working employee in the building you need to infiltrate is complaining:

> This chemoreceptor patent-proposal is kicking my ass. Hundley won't let me down until it's done. Hardly worth filing for, in my opinion. Who wants to smell the difference between xenon and radon?

the mechanism has to do with chromatin and quantum entanglement in the bands that connect the rods (cones?) in their retinas. don't think the bodymod crew is going to catch up to this any time soon... AR will get there first for sure.