Protanopia
Red cones are missing or non-functional. Reds appear darker and can be confused with greens and browns. Affects approximately 1% of males.
See the world through different eyes
Simulate three types of color vision deficiency in real time. Upload an image or pick a color, then toggle between normal vision and simulated views.
Simulator
Drag & drop an image here
or browse files
No image loaded
Original
Upload an image or pick a color
Simulated (Deuteranopia)
Simulated view appears here
About color vision deficiencies
Deuteranopia
Green cones are missing. This is the most common type of CVD, affecting about 1.5% of males. Greens and reds look similar, and colors appear muted.
Tritanopia
Blue cones are missing. Very rare, affecting less than 0.01% of people. Blues appear greenish and yellows can look pink or disappear entirely.
Designing for accessibility
- Never rely on color alone to convey information — add labels, patterns, or icons.
- Ensure sufficient contrast between text and background (WCAG recommends 4.5:1 for normal text).
- Test your designs with simulators like this one before finalizing palettes.
- Use underlines for links, not just color changes.
- Consider providing a high-contrast mode or theme toggle in your applications.
This simulator uses the Brettel-Viénot-1997 method adapted for real-time canvas rendering. It provides an approximation and is intended as a design aid, not a medical diagnosis.