what precent of men have color blindness?

Answer 1

Color blindness affects about 8 percent of men, and approximately 0.5 percent of women.

Check out this link, it will tell you if you have colorblindness or not, and some more info about it:
http://channels.netscape.com/atplay/colorblind.jsp

Answer 2

Direct quote from website below:
Inherited color blindness is most common, affects both eyes, and does not worsen over time. This type is found in about 8% of males and 0.4% of females.

PS....both my older brother and my son have this color blindness in which they have difficulty with reds and greens.
There is more than one type of color blindness and so the percentages may be different for different types.