I enjoyed completing this Online Color Challenge by X-Rite. It takes a few minutes to do it properly. According to X-Rite: ’1 out of 255 women and 1 out of 12 men have some form of color vision deficiency.’
Of course it depends on the computer monitor settings, and I wouldn’t put too much weight on the results. But I do try to adjust the Yarnomat product photos to represent the yarn as accurately as possible, so it’s comforting to know that I have ‘perfect color vision’. 
