About This Condition

When color is the only signal distinguishing success from error, or active from inactive, critical information disappears. Red-green confusion is most common, but all types of color vision deficiency require interfaces that use shape, label, and pattern alongside color.

Digital Challenges

Error states shown only in red, status indicators using color alone, and charts without patterns or labels all become meaningless. People with color blindness must guess at meaning that sighted users read instantly, increasing errors and task abandonment.

Assistive Technologies

• Color blindness simulator tools
• high contrast mode
• screen readers

Design Considerations

Never use color as the only signal for status, error, or meaning. Add icons, text labels, or pattern fills alongside all color-coded indicators. Test all data visualizations using a color blindness simulation tool before release.

Clinical Examples

Deuteranopia (red-green), protanopia (red-green), tritanopia (blue-yellow), achromatopsia