This is refers to the inability of a person to correctly distinguish certain colors.
Complete color blindness, to view the world in only black and white, is rare.
Most of them are color deficiency, which has problems distinguishing between the colors red and green, mistaking them for the same color. A less common type of color deficiency involves the colors blue and yellow.
Color blindness is usually hereditary(you are born with it). More males are affected by the disorder than females.
Occasionally, certain eye diseases cause color blindness, referred to as "Acquired Color Deficiency."