Rare diseases · Sign or symptom
Tritanomaly
Blue yellow color blindness
HP:0000552
What it means
Difficulty distinguishing between yellow and blue, possible related to dysfunction of the S photopigment.
Rare diseases that can present with this3
The range is how often this sign appears among people diagnosed with each disease — it is not a probability of having any of them. Many of these signs also occur in common, non-rare conditions. A sign on this page is a conversation to have with a clinician, not a conclusion.
Part of the broader category
Also called: Blue yellow colour blindness · Blue-yellow dyschromatopsia · Blue/yellow color vision defect · Blue/yellow colour vision defect · Dyschromatopsia, blue-yellow
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Start free with EleplanThis page uses the Human Phenotype Ontology (2026-06-23) — Human Phenotype Ontology Consortium, hpo.jax.org. Disease associations from Orphanet (INSERM), CC BY 4.0. Content is educational and is not medical advice.