Color blindness is the reduced ability to distinguish colors or to see color. This condition affects about one in 200 women and one in 12 men worldwide. Most people with color blindness can see things as well as ordinary people. But, they are unable to differentiate colors, especially red, blue, or green.

  • Protanomaly is a reduced sensitivity to red light.
  • Deuteranomaly is a reduced sensitivity to green light and is most common form of color blindness.
  • Tritanomaly is a reduced sensitivity to blue light.


Red-green color blind people have deuteranomaly and protanomaly and they generally have difficulty distinguishing between reds, greens, browns and oranges. For them confusion between different types of blue and purple hues is common.