OK, so just I came across this site:
http://colorvisiontesting.com/
I've seen the dotty color tests before, and I know I'm not colorblind. What I found interesting was the page with approximations of how someone who
is colorblind would see those dotty color tests.
(However, this still doesn't explain why I can't see the pictures in those stupid magic eye posters that were all the rage in the early 90s. WTF was up with those? I still think those were an evil conspiracy. No one saw pictures in those, right? Right?)