Approximately 1 in 12 men (8%) and 1 in 200 women suffer from colour blindness. There are many different forms of colour blindness:
Use these three helpful rules when choosing your colours
Make sure your design works in greyscale (black and white) before adding in colour. Do not assume colours will signal meaning when used on their own.
The richest colour across all types of colour blindness is blue, so blue is often a good colour choice.
Avoid using red and green together as they are difficult to distinguish from one another in the more common types of colour blindness.