Well most of us, who are color blind, are color-blind to two particular colors(me included)
I'm not, i forget what they call i, but my colour blindness is the inability to distinguish between shades, i can see solid colour, but dark red, bright red, light red, all looks the same to me, as do different shades of all the other colours. i kind of live in a cartoon world but without the black outline around everything.
I am mildly red-green colorblind. I can see all colors but have trouble distinguishing between certain shades of light greenish brown and reddish- brown. Beige colors basically.
It's enough to make me not see the red on some floor backgrounds.
For me a blue option is what would work (like the Witcher 3).
ZOS, just have a colorwheel option for red zones that let's us pick our own color for our own particular color vision.
^This needs to be a thing. Not only that, but the red telegraphs need to be made more obvious. I main a sorc, and it's impossible to see with liquid lightning and elemental blockade on the ground, not to mention, I'm colorblind on top of that.
I agree Color blind people have a struggling seeing the AOE. But I would suggest that there should be a toggle in the option to allow AOE and effects to be less visually awesome but more easily to be spot for everyone! Reducing the CPU/GPU resource usage in the process as well. Raids are having huge FPS impact on many of our potato computers and such option might give them some fresh air to breathe.