Free eye check · 3 min · No sign-up
Color blindness test (free color vision screener)
A free color vision screening with dot plates drawn fresh each time. Screens for red-green and blue-yellow color vision deficiency in about three minutes.
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A screening aid, not a diagnosis. Screens, lighting and distance affect results. If something looks wrong, or your vision changes suddenly, see an eye-care professional. Medical disclaimer
How the screener works
Each plate is a circle of colored dots. A number is hidden in dots of one color family, surrounded by dots of another family with similar brightness. People with typical color vision see the number clearly; people with certain color vision deficiencies see a jumble of dots or a different number.
The first plate uses light and dark grey, which nearly everyone can read. If you miss it, the problem is likely the screen or settings rather than your color vision.
Types of color vision deficiency
- Red-green (protan and deutan): by far the most common, usually inherited on the X chromosome, which is why it affects many more men.
- Blue-yellow (tritan): rare, and more often caused by eye or nerve conditions or some medicines.
- Complete color blindness (achromatopsia): very rare, usually with poor vision and light sensitivity.
Getting a reliable result
Turn off night mode, blue-light filters, color filters and true-tone settings. Use full brightness and look straight at the screen. Phone screens and older monitors can shift colors, so repeat on another device if your result surprises you.
Why it matters
Color vision affects some careers and licences, including aviation, electrical work and some military and transport roles. Children with undiagnosed color deficiency can struggle with color-coded schoolwork, so let teachers know if your child is affected.
Questions people ask
Is this the Ishihara test?
No. The Ishihara plates are a published clinical test. Our plates are generated by your browser from color pairs that people with color vision deficiency tend to confuse. They follow the same idea but are a screening only.
How common is color blindness?
Red-green color vision deficiency affects about 1 in 12 men and 1 in 200 women of Northern European descent. Blue-yellow deficiency is much rarer.
Can color blindness be cured?
Inherited color vision deficiency has no cure. Special tinted glasses help some people tell certain colors apart, and apps can label colors. A new color vision change in adulthood should be checked, as it can come from eye disease or medicines.