Peam just finish his version of street fighter puzzle and I while i was playing with him, I had problem detecting a yellow gem from a green gem. I can detect, but hardly. I have to adjust the color value of the gem a bit so that I can clearly distinguish green from yellow. That is quite strange coz other guys in the lab can tell which one is green or yellow very easily.
So I took Ishihara Test, and it turned out that I am a color blind :O. Furthur investigation at wikipedia reveals that I am a kind of protanopic, i.e., having problem with the red color (so that I have a problem telling yellow and green apart). On the Ishihara test, i pass 4 out of 6. I cannot answer the number in the bottom test. Well, there are two kinds of protanopic, protanomaly and protanopia. The first one is anomaly, i.e., lesser sensitivity to the red color (both saturation and brightness) while the other is completely red defunct. I am protanomaly (the web said that it is about 1% of male population for white ppl.) Most color blind people is Deuteranomaly, green-weekness.