Skip to content
Detect Color Blindness

Blue-Yellow Color Blind Test

Tritan deficiency is rare, and, unlike red-green types, it affects men and women about equally. These plates focus on the blue-yellow axis.

Plate 1 of 8

What number do you see?

No timer · answers stay on your device

Tip: view in good lighting at 100% screen brightness for the most reliable result.

Not a medical diagnosis. This is an educational screening tool, not a clinical exam. Screen brightness, colour settings and lighting all affect the result. For anything that matters, a driving or aviation medical, a job requirement, or a health concern, book a professional colour-vision test with an optometrist or ophthalmologist.

What blue-yellow color blindness is

Blue-yellow deficiency, or tritan deficiency, involves the blue-sensitive (S) cones. It makes blues and greens hard to separate, and yellows can look washed out or pinkish. There are two forms:

  • Tritanomaly: reduced blue-cone sensitivity (milder).
  • Tritanopia: no working blue cones (stronger); one of the rarest colour deficiencies.

Because it is usually not inherited on the X chromosome, tritan deficiency does not show the strong male bias of red-green types. It can also be acquired: from ageing, some medications, or eye conditions, so a new blue-yellow problem is worth a professional check.

A note on screen accuracy

Blue-yellow plates lean on precise blue and yellow rendering, which varies a lot between monitors and is easily thrown off by night-mode colour shifts. Treat an online tritan result as a rough indicator. If it flags a deficiency, confirm it with an optometrist. You can also try the full color blind test or the hard mode for more plates.

Frequently asked questions

What is blue-yellow color blindness?
Also called tritan deficiency, it makes blues and greens, and yellows and pinks, hard to separate. It is far rarer than red-green deficiency and, unlike red-green types, affects men and women about equally.
Why is blue-yellow color blindness harder to test online?
Blue-yellow plates depend on precise blue and yellow rendering, which varies a lot between screens. Treat an online tritan result as a rough indicator and confirm with a professional test.

Keep exploring

What next?

Take the color blind test 14 quick plates · instant type & severity · no sign-up. Start the test → See how you see colour Simulate protan, deutan, tritan & more on any image. Open the simulator → Do colour blind glasses work? Honest comparison of EnChroma, Pilestone & ColorLite. Read the guide →