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Designing for People Who are Color Blind
Inclusive design for color blindness requires providing non-color visual cues and ensuring contrast ratios remain sufficient for all users.
What: Accessibility specialist Demelza Feltham advises against relying solely on color to convey information (WCAG 1.4.1). She recommends combining colors with icons, patterns, or labels, and testing interfaces using grayscale or color-blindness simulators like Coblis.
Why it matters: Relying on color for status indicators, errors, or data visualization excludes a significant portion of the population, impacting roughly 1 in 12 men.
Takeaway: Perform a 'grayscale test' on your UI components to ensure that interactive elements like disabled buttons or error messages are distinguishable without hue.
Decoder
- WCAG: Web Content Accessibility Guidelines, the standard set of rules for making web content accessible to people with disabilities.
- Protanopia: A form of red-green color blindness involving reduced sensitivity to red light.
- Deuteranopia: A form of red-green color blindness involving reduced sensitivity to green light.
Original article
Color blindness affects about one in 12 men and one in 200 women, making key information, interactive elements, and color-coded data harder to perceive. Designs should pair color with an icon, pattern, or text label per WCAG 1.4.1, keep sufficient contrast, and avoid red-green and purple-blue pairings. Blue is a safer hue, though not guaranteed. Grayscale checks help, and hover, focus, and disabled states need non-color cues, ideally tested with real people.
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