Opponent Process Theory

The Opponent Process Theory is easily explained that we perceive colors in terms of three different pairs of colors. These pairs are red or green, blue or yellow, or black or white. This theory is important because, it explains how we see things. It lets us understand how illusions work and confuses the eye. I have experienced illusions where you stare at a picture for a certain amount of time and when you look away you see the same picture with a different color. It can be explained by the Opponent Process Theory. Here is another example of an illusion that uses the Opponent Process Theory (http://www.youtube.com/watch?v=V8xo2y3N-_c). There are a few questions I still have about the Opponent Process Theory. I would like to know more details on why our eyes work like that. Also I would like to know how this theory affects people are are color blind. Overall, the Opponent Process Theory is very interesting and explains how illusions are seen through our eyes.