Interesting. I got my new eyeglass prescription a few days ago and there he had me do some of these tests:

Then a week later we got a referral to a colorblindness specialist. I guess I must have failed the tests. We went there and had me do a bunch more of those tests as well as some tests where there was a number on a plain grey background I was supposed to see. I didn't see it.
So, it turns out I have a rare form of colorblindess called tritanopia. This means while you guys have receptors for red, green and blue wavelengths in your eyes I only have red and green which means blue and green look the same to me and pink and yellow look the same.
Weird.
Rainbow to you (these two look almost the same to me):

Rainbow to me:

On a positive note, this means I can't be drafted. :D