Here’s a cool site called the Online Color Challenge that ascertains how well you see color, and how much you can differentiate between the various hues of a color as it evolves from one value to another.
In its original form, this site contains four self-contained rows of jumbled-up color chips that you need to drag and place so that each color chip is suitably similar to the ones before and after them.
This example demonstrates how the color chips were rearranged, even though the result is not entirely correct. Figure 1, below, shows the rearranged chips.
Figure 1: Rearranged Color Chips
Figure 2, below, shows the results, with a score of 12, where smaller scores are better than larger ones. Another participant scored 3, while someone else had a score close to 90.
Figure 2: The score
Participants were then asked to provide their age and gender, and the score was compared with others of the same gender within a similar age group. This comparison is shown in Figure 3, below.
This is great fun if you have 10 to 15 minutes to spare. Go here to play.

