Question 1

What types of color blindness does the simulator support?

Accepted Answer

The simulator supports the four main types: protanopia (absent red cones, affects ~1% of men), deuteranopia (absent green cones, affects ~5% of men and is the most common form), tritanopia (absent blue cones, very rare at ~0.003%), and achromatopsia (complete color blindness, sees only shades of gray, also very rare).

Question 2

How does the color blindness simulation work?

Accepted Answer

The simulator applies mathematically derived SVG feColorMatrix filters that transform the RGB values of your UI to approximate what each color vision type perceives. The transformation matrices are based on the Machado, Oliveira, and Velho (2009) model, which is the industry standard for accurate simulation.

Question 3

How common is color blindness?

Accepted Answer

Color vision deficiency affects approximately 8% of men and 0.5% of women with Northern European ancestry. Deuteranopia (green-weak) is the most prevalent form at roughly 5% of men. For a product with a significant user base, not designing for color blindness means excluding a measurable portion of your audience.

Question 4

What design changes help color-blind users?

Accepted Answer

Never use color as the only signal — pair it with icons, text labels, or patterns. Ensure sufficient luminance contrast, which helps all types of color vision. Prefer blue/orange combinations over red/green, which are the most commonly confused hues. Test your UI with a simulator early in the design process, before visual identity is locked in.

Color Blindness Simulator

Sample Form