Definitions for "Colour blindness"
Colour blindness is an inability to distinguish between certain combinations of colour. About 8% of males and 0.5% of females have some form of colour blindness. Red-green colour blindness is most common, followed by yellow-blue colour blindness. To avoid problems for our users, our website does not rely solely on colour to distinguish between objects. For example, all text links are underlined.
genetic inability to distinguish differences in hue
Diminished ability to perceive differences in colour - never a complete absence of colour vision.