Are you color-blind?
This article below discusses the accidental discovery of glasses that can enable color-blind children and adults to see colors in the green and red spectrum.
http://www.smithsonianmag.com/innovatio ... 56/?no-ist
Below is a link to another article and a video.
http://www.huffingtonpost.com/2015/03/2 ... mg00000022
And here is the home test for colorblindness: http://enchroma.com/test/instructions/