Colorblindness & Usability: A Case Study of Microsoft, Amazon & IBM: I didn’t know colorblindness was so prevalent.
I am one of the 10% of the male population who is colorblind. Approximately one million people visit Amazon.com each day. If we assume that half of these visitors are male, then approximately 50,000 will be colorblind. Few of us can afford to frustrate 10 customers, let alone 50,000!
His biggest piece of design advice?
Fortunately the solution is simple and can be summarized in one word, contrast.
You do not need to hire a team of colorblind usability experts (Nuts!). Simply remember that whenever you use a colored background for a page or a graphic, make sure the text message on it has strong contrast to the colored background.