The first portion of the article talks about why some primates evolve to see different colors (3 dimensions of color).
One theory is that that primates evolve to distinguish fruit colors on trees. However, this article suggests that primates evolve to see different colors to sense emotions. For this reason, primates that can see 3 dimensional colors have no fur on their faces, etc. Blood color changes depending on the amount of oxygen present and so the color vision is sensitive to that color.
The second half of the article is about how the theory is used to come up with glasses for color blind people.
http://www.popsci.com/science/article/2013-02/how-mark-changizi-conquered-colorblindness-glasses