Well, it is a special kind of color blindness and I'm actually one of those guys affected by it. Recently I thought about posting something about it for sharing my experience with others but a friend of mine - Manfred - was faster :) He wrote a very nice FAQ with a lot of information regarding this topic.
So, before posting things redundantly, I'm linking to his post:
And I say it once again:
- It is neither a disease
- There is a clear difference in being color blind or having a red-green deficiency! I see colors, just a little different than the majority of people (always the majority defines which things are "right" ;) ). I'm not only seing things in black-white.
- We are able to drive normally, traffic lights do not pose any problem at all
However read Manfred's post on his blog
... it answers most of the questions!