Before you can understand the cause of color blindness, you first need to know the rods and cones of our retina. They help us see things in varying color and degree of brightness. Acting as a photoreceptor, cones differentiates the colors and shades for our eyes. The light sensitive pigments are particular to wavelengths. For short wavelengths, we have the color blue, green for the medium wavelengths, and red for higher wavelengths. You won't be able to distinguish colors if there's a deficiency in the cone. Missing the green and red hues has direct effect to sensitivity to brightness. Hence, it triggers
color blindness.
