Looking for Madam Tetrachromat
february 2006 by joeclark
Are there people with *four* colour receptors on the retina? (You probably have three. Colourblind people have two or have three that slightly malfunction)
colourblindness
colourdeficiency
tetrachromat
february 2006 by joeclark
Colorblindness Information Page
january 2006 by joeclark
Interesting layperson’s conversations about colour deficiency
colourblindness
colorblindness
colourdeficiency
january 2006 by joeclark
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