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Posted By: Keith O'Leary

More than 95 percent of all variations in human color vision involve the red and green receptors in men's eyes. It is very rare for anyone—male or female—to be "blind" to the blue end of the spectrum, although it can occur. There is a genetic explanation for this phenomenon. The gene coding for the blue receptor lies on chromosome 7, which is shared equally by men and women, and that this gene does not have any neighbor whose DNA sequence is similar. Blue color blindness is caused by a simple mutation in this gene.

Red/green color blindness is not simply a problem with confusing red and green. It also causes problems with an unlimited pairing of colors that fall on the confusion line. For example problems can occur distinguishing between blue-green and pink or blue-green and purple. Color-blind individuals may not be able to distinguish between olive-colored and rust-colored socks, while they could distinguish between bright green and olive socks, rust and red socks or rust and bright green socks.

Now.....bluish / green...real problematic, . Wonder if dark green or dark blue can look black to a color blinded person?