A friend sent me the link to the X-Rite Color Challenge and I found it interesting. The test measures the color deficiency you may have in terms of discerning hues. and then scores you accordingly. The results, display the areas of the spectrum where your color discrimination is low in a visual format as well as providing a grade. I scored an 11 after some very high concentration and tedious work. Your eyes may bug out before you finish. Post below in the comments with your results.