Color blindness means your eye doesn't see color the way it should. Your eyes see differences in the light that comes in. It’s a bit like the way we hear sounds as being low or high. This is called pitch, and it corresponds to the frequency of the sound, or how many times it vibrates in a given time period. The keys on the left side of a piano keyboard make low-frequency sounds. The frequency rises as you go to the right. There’s a similar order to the colors we see. The colors of every rainbow always appear in the same order: red, orange, yellow, green, blue, indigo, and violet. The different colors in each part of the rainbow correspond to a different wavelength of light. Reddish colors have a long wavelength. Bluish colors have a shorter one. Just as there are many notes on the piano, many wavelengths of light match the different colors. How Does Your Eye See Colors? Think of your eye as a camera. The front part has a lens. Its job is to focus images on the inside of the bac...
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