[bitbandit]

I am guessing that 14% = color blind + users with cataract + various other visual impairments.

You usually can't have a design that makes all of them happy at once.

For example, high contrast UI themes often leave large white areas on the screen that users with glaucoma find blinding, but other users like a lot.

[JackFr]

I'd like to see the original survey. 14% sounds awful high.

http://www.nei.nih.gov/CanWeSee/

http://www.webexhibits.org/causesofcolor/2C.html