What halachot are affected if a person is colorblind? One probable example I can think of relates to the laws of niddah and checking emissions. Another less likely example would be the the halachic time defined by when a person can distinguish between leek-green and turquoise (though I doubt that this is really affected if a person is colorblind).
Note: There are various different types of color blindness, as described on Wikipedia. I am interested in how all of these affect halacha.