>As I've already demonstrated, I'm no expert on colour-blindness, but
>from what I've read, "full colour blindness" is a progressive illness
>that leads to actual blindness, and it is indeed extremely rare.

Some people are born fully colour blind. I remember the son of a friend who 
had full colour blindness, when colour TV was about to be introduced, asked 
'why, its in full colour already' ... 

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