Colourblind isn't the complete absense of colour, e.g. everything looks black and white. With deuteranomaly, you are the actual textbook definition of colourblindness... There are different levels of it, but all can still perceive colour - it's just whether the difference in colour of the spectrum is detected correctly.

Deuteranomaly (/ie) is the reduction in reactivity of the red-colour receptors. That means your perception of orange/red/brown is less than those with normal vision.

For those with normal vision, this is a great chart. But, if you're colourblind, it'll be more confusing for you, sorry!

[–] PeleSpirit@lemmy.world 5 points 2 years ago

So everyone can see a form of blue, most being royal blue? That's super interesting because there's a saying in art, "If you can't make it good, make it blue."

[–] crystal@feddit.de 3 points 2 years ago (2 children)

Why does the chart not include purple?

[–] calavera@lemm.ee 3 points 2 years ago* (last edited 2 years ago)

It does include purple, it's a little bit before the 400nm mark.