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Which pair of colours is the most common source of difficulty for readers with colour vision deficiency?

  • A.black and white
  • B.orange and brown
  • C.red and green
  • D.blue and yellow

Answer: C

Deuteranomaly and protanomaly, the two commonest forms, both affect the red-green axis, and together they account for the great majority of cases. Blue-yellow confusion exists but is very much rarer, which is why the red-green pairing is the one design guidance singles out.

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