Just lighter and darker shades," Mark said. Mark had discovered he was color blind. Color blindness, or color vision ...

There are almost three million colour blind people in the UK - that is enough to fill Wembley stadium more than 30 times. The NHS describes colour vision deficiency as when someone finds it ...

Colour blindness, or Colour Vision Deficiency (CVD), impacts one in 12 boys and one in 200 girls—about one child in every average co-ed classroom. Despite its prevalence, CVD remains largely ...