 Look at the pictures below. Do you see a puzzle piece in the picture on the left? If you do, you have normal color vision. The picture on the right will give you an idea of how the color picture would look to someone that is totally color blind. It is the same picture using shades of grey. Without the colors as a reference the image in the picture disappears.
It is very rare to be totally color blind. In fact, the most common form of color blindness is red/green color blindness. Approximately nine percent of the population are affected. Those that suffer from red/green color blindness would see the color image above as either all red or all green. The color they see depends on which rods they are missing.
If you have normal color vision, here is another interesting test. First stare at the color picture below and then move the mouse pointer on top to switch the image to the black and white version. If you look carefully you will notice the image will briefly be in the opposite color! This is because you wore-out some of your cones and are now seeing the image with whatever cones are still operating. This works with Netscape 3.0 and higher or Internet Explorer 4.0 and higher.
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