Color blindness is an interesting condition to most. We wonder what it must be like to not distinguish colors—that we take for granted. Most humans can live with color blindness because it is present at birth and go years without realizing, they are colorblind.
The cause of color blindness usually involves faulty cones. Cones are cells in your eyes that distinguish the three wavelengths of light. Light can be split into red, green, and blue for the spectrum visible to humans. Color blindness happens because the cone cells are faulty and do not show distinct colors. A person may see shades of yellow and blue, for example, but have problems distinguishing red and green. Many people believe that color blindness means seeing only in black and white, but that is far rarer.
Also, color deficiency is much more common in men than women. Only up to 1% of the female population has trouble seeing various colors, where somewhere between 8-12% of the male population is color blind.
Color blindness is usually an inherited genetic deficiency with the cones, but symptoms of color blindness may also occur due to stroke, old age, or a problem with pathways from the cones to the brain where the brain can determine colors.