I never knew I was colorblind (red/green) until I was in high school -- we were looking at Ishihara plates (http://en.wikipedia.org/wiki/Ishihara_Test http://en

I never knew I was colorblind (red/green) until I was in high school -- we were looking at Ishihara plates (http://en.wikipedia.org/wiki/Ishihara_Test http://en.wikipedia.org/wiki/Ishihara_Test) in class and I told the teacher there must be something wrong because I couldn't see what we were supposed to see. I thought I had gotten a bad photocopy, because I couldn't believe I had gone through life not noticing that I was colorblind. As I've aged I start to notice it everywhere though -- video games, greeting cards (hello Christmas colors), and websites alike. Just yesterday, in fact, I was reminded when I checked the reservation status for my ZipCar -- it looked like this: http://i.imgur.com/OkC2dG0.png http://i.imgur.com/OkC2dG0.png. I decided to tweet them and give them a suggestion of how to fix it (my idea: http://i.imgur.com/nNVUXLO.png http://i.imgur.com/nNVUXLO.png), but in general it surprises me how infrequently designers/developers will think about a large portion of the population (8-10% of males) when they sometimes will spend days making sure IE8 or other browsers with increasingly smaller marketshare look great.