Tritan (Blue-Yellow) Color Blind Test
An honest note: Ishihara plates cannot screen blue-yellow deficiencies, so we won’t put a fake test here. This page explains what actually works — and why new blue-yellow symptoms deserve attention.
Our online tritan test is in development
Plates built on blue-yellow confusion lines only make sense with careful color calibration, and we are still refining ours. Meanwhile, the red-green screen below covers over 95% of congenital color vision deficiencies.
Which tests can screen for tritan?
- Farnsworth D-15 — arrange 15 color caps by hue; the direction of errors distinguishes red-green from blue-yellow axes
- Farnsworth-Munsell 100-Hue — a finer-grained hue arrangement test that quantifies discrimination
- HRR plates — pseudoisochromatic plates that include both red-green and blue-yellow designs
Start with the screen that covers the most
Over 95% of congenital color vision deficiencies are red-green. Two minutes tells you where you stand, including protan/deutan tendency.
Take the Red-Green TestFrequently asked questions
How common is tritan deficiency?
Congenital tritan deficiency is very rare (roughly 1 in 10,000, affecting all sexes equally). Acquired blue-yellow deficits are more common — cataracts, glaucoma, diabetic retinopathy, certain medications, and normal aging can all cause them, which is why new blue-yellow symptoms deserve an eye exam.
Why can’t Ishihara plates screen for tritan?
Ishihara colors are placed along red-green confusion lines, so they only expose red-green deficiencies. Tritan confusion happens along the blue-yellow axis and needs plates designed on those confusion lines (like HRR) or arrangement tests (like the D-15).
I suspect a blue-yellow problem — what should I do?
If the change is recent or progressive, book an eye exam soon: acquired tritan shifts are often a sign of an underlying eye condition. Clinicians can assess it with the D-15, FM-100, or HRR plates.
This page is educational and not medical advice. New or progressive blue-yellow symptoms warrant a prompt eye exam.