I have deuteranomaly, and the hallucination worked for me, and it did appear like a crazy saturated blue-green ring around the shrinking red circle.

I suspect, however, that those of us with deuteranomaly probably see a different blue-green than normal-sighted folks due to the bent color cones.

The real question is, what about the folks with Deuteranopia (no working green cones at all)?

Deuteranomaly, though, is still probably the best place to start since that's the big one that affects (some say) up to 10% of all males. Every other form of colorblindness affects a much slimmer percentage of the population.

Didn't work for me. I notice that the color around the circle changes, but it's just a palish blue-something, not a new color, certainly not intense. Too much overlap, I guess. Perhaps it works when changing the background to blue?

I fail on the first page of the Ishihara (?) test. When using those colorblindness filters in photoshop/-like apps, the protanopia and deuteranopia filters do very little for me. No 'real' diagnosis. I can see red and green though, but the shape needs to be big, and the color should be quite saturated. Reading resistors is really hard.

The red inside, reddish-orange outside was a little strange - I'm not colour blind, but have a really hard time distinguishing shades. As soon as I focused on the white dot, the red circle started to blend with the background and disappeared completely (was just one single colour for me). Only when it started shrinking did I hallucinated a faint green aura around it until it was gone.

The animation worked for me, I'm red-green colorblind.

I have red-green weakness but only saw a lighter green around the circle as it became smaller.

I saw this as well.