You have an interesting question! People who are red-green color blind do see some color (not just black, white, and gray), but they see the colors differently than people who have all three functioning cone cells (red, green, and blue cones). Check out the sample "rainbows" on this Wikipedia page:http://en.wikipedia.org/wiki/Color_blin ... _blindness
The problem with color blindness is that the photoreceptors
are malfunctioning. Photoreceptors are the cells that detect light and send signals to the brain in response to certain kinds of light. As I mentioned above, humans have three types of cone cells
(the photoreceptors most sensitive to bright light):
(1) red-sensitive cones, (2) green-sensitive cones, and (3) blue-sensitive cones. These cone cells are named for the wavelength that most excites them.
The main problem for people with red-green color blindness is an inability to tell the difference between red and green. I do not think that you will be able to make them see new colors with special glasses, since you cannot change the funtionality of their cone cells; however, it would be interesting to see if you could design glasses that would refract
light in such a way as to help make green and red more distinguishable. In other words, if the glasses refracted the two wavelengths differently, maybe the people would see them as two different colors (though probably still not as traditional "red" and "green").
I suggest that you do some more research on color blindness and light refraction
, and post back here with your questions.