What is Color Blindness Test?

The Color Blindness Test uses Ishihara-inspired color plates to help you screen for color vision deficiency. Pick numbers mode to read digits hidden in the dot pattern, or shapes mode to tap circles, triangles, and squares — useful for young children. Both modes cover red-green and blue-yellow deficiencies.

Each plate hides a figure inside a field of coloured dots tuned to confuse specific photoreceptor weaknesses. Numbers mode embeds a digit; shapes mode embeds a circle, triangle, or square so young children and pre-literate users can still take the test. Some plates target red-green deficiency (protanopia and deuteranopia), others target the rarer blue-yellow (tritanopia). After the last plate, you get a per-plate summary plus a one-click Copy summary button you can paste into a message to your eye doctor.

How to use

1. Pick Numbers or Shapes mode on the start screen, then begin the test and look at the first plate carefully
2. Type the number you see in the dot pattern, tap the matching shape, or select "I can't see" if nothing emerges
3. Complete all plates and view your results with an explanation of any detected deficiency

When to use

• Curious whether the colours you struggle with at work might be a vision issue.
• A parent screening a child before booking a paid eye exam.
• Designers checking their own perception before signing off on a critical palette.

Result

Read 12 on plate 1 and 74 on plate 2 but miss plate 5 and plate 6 — that pattern of misses on the blue-yellow plates suggests a possible blue-yellow weakness rather than a red-green one.

FAQ

Is this a replacement for a clinical exam?

No. Real Ishihara plates use carefully tuned ink on paper under controlled lighting. A screen test is a useful first hint, but only an optometrist or ophthalmologist can give you a real diagnosis with calibrated equipment.

Why do I see the number on some plates and nothing on others?

Plates are designed to filter for different deficiencies. Someone with red-green deficiency can still read most blue-yellow plates and vice versa. The pattern of misses, not the total count, is what suggests a specific type.

Does screen brightness or night mode change the result?

Yes, quite a bit. Run the test on a bright screen in neutral lighting with any blue-light filter or warm night mode disabled. A warm-tinted display can mask exactly the colour cues the plates depend on.

How rare is colour blindness?

Red-green deficiency is common, affecting roughly 8% of men and 0.5% of women of European descent, with somewhat lower rates in other populations. Blue-yellow deficiency is much rarer, around 1 in 10,000.

Does the test send my answers anywhere?

No. Plates render and answers tally inside this page only — nothing is uploaded. When you close the tab, the result is gone, so tap Copy summary on the results page to save a plain-text record you can paste into a note or email to your eye doctor.

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