Tritan Test (Blue-Yellow)
A focused screening for tritan deficiency, the rare blue-yellow type of color vision deficiency, which is often acquired rather than inherited. Read the number in each plate for an estimate.
You'll see 10 plates of colored dots. For each one, tap the number you see, or "I can't see a number." Go with your first impression; each plate has a short timer.
Some plates show no number to most people, and “I can't see a number” is a normal, expected answer, not a failure.
Best on a phone or laptop at full screen brightness. Keyboard: press a number key, or Enter if you can't see one.
What tritan vision is like
Tritan color vision deficiency affects the blue-sensitive cones. It sits on a different axis from red-green deficiency, so the confusions are different too: blues can be mistaken for greens, and yellows for pinks or light greys.
Two things make tritan deficiency distinctive:
- It's rare, and affects men and women roughly equally, unlike red-green deficiency, which is mostly in men.
- It's often acquired rather than inherited linked to aging, some eye conditions, or medications so a new result is worth a professional check.
Because blue-yellow plates are so sensitive to screen calibration, treat a tritan screening result as a prompt to get checked, not a conclusion.
Frequently asked
What is tritan (blue-yellow) color blindness?
Tritan deficiency affects the blue-sensitive (S) cones, making blues, greens, yellows and pinks hard to tell apart. It's much rarer than red-green deficiency and affects men and women about equally.
Is tritan color blindness inherited?
Often it isn't. Unlike red-green types, tritan deficiency is frequently acquired from aging, eye conditions, or certain medications rather than inherited. Because of that, a new tritan result is worth checking with an eye professional.
Why might a screen show a tritan result that isn't real?
Blue-yellow plates are especially sensitive to a display's color calibration. A miscalibrated or dimmed screen can mimic a tritan deficiency, so treat a tritan screening result cautiously and retest on another device.