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Blue-Yellow Color Blind Test
Six dot plates that test the blue-sensitive (S) cones. Blue-yellow color blindness, called tritan, is rare from birth but can come on later with age, cataracts, diabetes or some medicines, and most red-green tests miss it.
Before you start
- Turn off night mode, Night Shift, blue light filters and dark-reader extensions. They change the colors and spoil the result.
- Set your screen to normal brightness and look at it straight on, in ordinary room light.
- Give each plate about 3 seconds. If you can’t see a number, pick “I can’t see a number” rather than guessing.
- Wear your glasses if you normally do, but not colored or blue-blocking lenses.
What number do you see?
Your result · of plates right
No sign of color blindness
You read every plate, so your red, green and blue cones look normal on this screen. Try the hard test to see how fine your color vision is.
Probably normal color vision
You missed one of the fainter plates, which happens with normal eyes too. If you often mix up colors, take the test again on another screen.
Let’s try that again
You missed the first plate, which everyone should be able to read, whatever their color vision. It may have been a slip, or your screen may be too dark. Check the brightness and take the test again.
You missed the plates that only the red-sensitive (L) cones can see. Reds and greens may look alike to you, and reds may look darker than they do to other people.
You missed the plates that only the green-sensitive (M) cones can see. This is the most common kind: reds, oranges, browns and greens can look alike.
You missed red and green plates about equally, so the test can’t tell whether your red or your green cones are the cause.
You missed the plates for the blue-sensitive (S) cones. Check that night mode or a blue light filter is off; if it is, mention it to an eye doctor, because blue-yellow changes can also come from the eye’s lens or eye conditions.
This is a screening test on a screen, not a diagnosis. Screens show colors differently, so only an eye doctor using printed plates or an anomaloscope can confirm color blindness.
Your answers
These plates are generated on the spot from cone science (Viénot, Brettel & Mollon, 1999); they are not copies of printed Ishihara plates. Want to know what color blind people see? Try the Color Blind Simulator.
About the Color Blind Test
The color blind test shows dot plates with a number hidden in them, like the plates an eye doctor uses, but generated fresh each time from cone science rather than copied. Each plate is built from two colors that look different to normal eyes but the same to people missing one cone type, so which plates you miss shows whether your red (protan), green (deutan) or blue (tritan) cones are affected, and the faint plates show how strong it is. There is also a red-green test, a blue-yellow test and a hard test with fainter plates.
How to use it
- 1 Turn off night mode and blue light filters, and set normal screen brightness.
- 2 Look at each plate for about 3 seconds and pick the number you see.
- 3 If you can’t see a number, choose “I can’t see a number” instead of guessing.
- 4 Read your result for red, green and blue cones, and look back over every plate.
Frequently asked questions
What is tritan color blindness?
Tritan color blindness affects the blue-sensitive (S) cones. Blue and green look alike, and so do yellow and violet or pink. Inherited tritanopia is rare, about 1 in 10,000 people, and it is as common in women as in men.
Can blue-yellow color vision change with age?
Yes. The lens yellows with age and cataracts filter blue light, and eye conditions such as glaucoma, diabetic eye disease and some medicines can weaken blue-yellow vision. A new problem with blue and yellow is worth telling an eye doctor about.
How accurate is an online color blind test?
It is a good screening test, but not a diagnosis. Screens differ in color and brightness, so a faint plate can be easier or harder on your screen than it should be. If the test suggests color blindness, an eye doctor can confirm it with printed plates or an anomaloscope.
What are the types of color blindness?
Red-green color blindness is by far the most common. It comes in protan (red cones) and deutan (green cones) types, each either mild (protanomaly, deuteranomaly) or strong (protanopia, deuteranopia). Blue-yellow (tritan) color blindness is rare, and seeing no color at all (achromatopsia) is very rare.
Is this the Ishihara test?
No. The Ishihara test is a printed book of plates. This test uses the same idea, a number made of dots among dots of a confusing color, but every plate is generated on the spot so you get new numbers each time.
Can color blindness be cured?
Inherited color blindness can’t be cured. Special tinted glasses can make some colors stand out more for some people, but they don’t restore normal color vision, and they can make this test harder to read.
Why is color blindness more common in men?
The genes for the red and green cones sit on the X chromosome. Men have one X chromosome, so one faulty copy is enough, while women need two. That is why about 1 in 12 men but only about 1 in 200 women are red-green color blind.
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