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Colour blindness, apparently there's a lot of it about ... [attachment=13215]http://www.museumofbadart.org/collection/portraiture-3.html
Interesting Q. As a person who once taught in a specialist school for dyslexic pupils, I was trained to write each line on the board a different colour, as this facilitated pupils' 'scanning'. Then I moved to a college with a SMART Board. There were at least 2 dyslexic students in the class ... one student who claimed that he was 'colour blind' and couldn't see the red and green at all.