Comment by tgv

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.