The Trichromatic Theory

The Trichromatic Theory explains our color vision depends on three different cones receptors within the retina of the eye. Each cone has a different sensitivity to certain wavelengths of light and interpreted by the brain as visible color. Our color vision is based on the primary colors: blue, green and red and the mixture of all three of these primary colors creates a complete color spectrum. I think this theory is important because it helps the world understand color vision. If all three cones were absent, our eye would only perceive things as gray. The Trichromatic Theory helped explain vision disorders such as color blindness, which is resulted from absence of a type of cone.
My uncle, Don, was diagnosed with being colorblind when he was younger. When he was around 6 years old, his mother started noticing he couldn't detect various colors. When Don would pick out his clothes for school, she would ask him " pick out the red shirt", he would simply pick up a green shirt instead. They took Don to the doctor and he was diagnosed with color blindness. The doctor told them he was born with it and usually patients don't realize that they are colorblind that's why Don's family just started recognizing symptoms. Don has an absence of a cone and he struggles with telling the difference of red and green. Also, another example to understand the history and a more in depth explanation of the Trichromatic Theory is by this youtube video URL: http://www.youtube.com/watch?v=-majiS83ACs
I'm wondering if a person who is colorblind, can distinguish all the colors of the spectrum in their dreams or if cone receptors are even related to what colors you perceive in dreams?