joeclark + colourdeficiency   7

Looking for Madam Tetrachromat
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
Interesting layperson’s conversations about colour deficiency
colourblindness  colorblindness  colourdeficiency 
january 2006 by joeclark

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