11. Nine Percent of Men and One-Half Percent of Women are Color-Blind

Color-Blind

"Color-blind" really means it's hard to differentiate between some colors. Typically hereditary, but can be caused by disease or injury. More common in men because most color genes are on the X chromosome.

Full-Color Vision

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Red-Green Color Deficiency

Designing for Color-Blindness

Use other design choices like line weight - in addition to color - to convey meaning so that those with color blindness can understand your message without needing to see the color differentiation.

... or pick a color scheme for everyone

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This graphic will looks essentially the same for someone with full-color vision, red-green color deficiency, or blue-yellow color deficiency.