and People who can’t see Blue

ะขhe most common colour confusions for tritanopes are light blues with greys, dark purples with black, mid-greens with blues and oranges with reds.

People affected by tritan color blindness confuse blue with green and yellow with violet. So the termย blue-green color blindnessย would be most accurate because the colors blue and yellow are usually not mixed up by tritanopes.

Tritan defects affect the short-wavelength cone (S-cone). There are two different types which can be observed:

  • Tritanopia: People affected by tritanopia are dichromats. This means the S-cones are completely missing and only long- and medium-wavelength cones are present.
  • Tritanomaly: This is an alleviated form of blue-yellow color blindness, where the S-cones are present but do have some kind of mutation.


Tritan defects can not only be inherited but also acquired during oneโ€™s lifetime. In this case it even may be reversible and not permanent like an inherited color blindness.

In the case of an acquired defect this is either evolving slowly for example simply through aging or coming instantly caused by a hard hit on your head.

Click here to see a simulator and experience the world as a person with Tritanopia

One thought on “Tritanopia

  1. I have tritonopia I can not see yellow at all. I had a “blue” Volkswagen Beatle , then had a yellow Nissan Juke. I thought they were the same colour. My husband has made jokes of it since! I see what I see and accept I don’t see what he does. Who is right?

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