Did you know that 1 in 10,000 people is yellow-blue colorblind? Red-green colorblindness is more common. For more on colorblindness, visit this National Institutes of Health (NIH) vision deficiency page.
But, how astute are ordinary people like you or I at perceiving the differences between colors? It turns out there is a free quiz for that - you can take this free Online Color Challenge and find out!
My score was a 31, which was a little disappointing since I wanted a lower score (lower scores mean you are more sensitive to color). I took the test again and this time, I turned the brightness of my computer monitor up to maximum. I got a much better score this time, an 8, although I still had trouble with the blue part of the spectrum.
Take the Munsell Hue Test - I bet you can beat my score!