Is Tetrachromacy Real? Definition, Causes, Test, and More
www.healthline.com
Tetrachromacy is a rare eye condition that allows for increased color vision. We’ll tell you about what causes it and how it’s diagnosed, as well as why you need to be skeptical of online tests.
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The original was posted on /r/todayilearned by /u/tyrion2024 on 2025-10-04 12:27:53+00:00.

Original Title: TIL a woman in a 2010 study, known as cDa29, was the first person to have been “proven by science” to have tetrachromacy. While a typical person has 3 cones (trichromat) in the retina that allow them to see about 1m colors, cDa29 has 4 cones (tetrachromat) that may allow her to see up to 100m colors