Color Vision

What is color blindness?  There are three different types of cells in the eye (called cones) that detect color.  Each shade stimulates the cells differently so that we can distinguish between colors.  When one of the cone cells doesn't absorb colors correctly, we can't see as many shades of colors.  Here is a technical power point slide to go into more detail:  http://colorvisiontesting.com/RABIN%20slide%20presentation%20for%20webpage.ppt#1