If so, how do you (if you guys are around) handle the issue? I just heard a story today about a Japanese smoke alarm for deaf people that uses the smell of wasabe to wake them, so I got curious.
If you're really curious, look at
http://www.webexhibits.org/causesofcolor/2A.html
Very few colorblind people are monochromatic (totally colorblind). Most colorblindness falls into the category protanopia or deuteranopia, which can see yellows and blues and browns. So syntax coloring can get set to those. Most of them have a hard time seeing light green, which looks orange, etc.