A fun little online test: Color acuity test

It tests to see how good (well, I suppose, also considering monitor quality) your color vision is. You are given a series of blocks of color, and you have to arrange them in hue order (for example, from green grading over to yellow). It's harder than it looks.

The score can range from 0 (perfect) to 99 (severe "impairment" in seeing colors). I scored a 3, which doesn't surprise me. (I will admit to "cheating" in that I squinted at the bars when I had finished them to see if anything "jumped out" as being in the wrong place...I do that when trying to match clothes or fabrics for a quilt too).

It also tells you where your color vision is "weak," if you don't make a perfect score. My 'weakness' was in the greenish-blue range. Interesting.