Given the large percentage of the population that suffers from color blindness and the severity of the problems they encounter on the Web, I thought we should take a look at how to design sites that will be usable to our color blind site visitors. Although there are various types of color blindness, nearly all color blind people have difficulty distinguishing between red and green. Many color blind people have problems with shades of colors. Most color blind people can detect black and white accurately. Most color blind people can see shades of blue and yellow.
Color perception varies from one color blind person to another.
Approximately 8 percent of men and 0.4 percent of women have some form of color blindness. Design Tips Avoid using color as a visual cue . If you do use color as a visual cue, make sure that you have provided adequate alternate cues. Make sure there is strong contrast between the background and foreground text or graphics. Consider using blues and yellows rather than reds and greens in your design.