With color blindness you will have difficulty is seeing certain colors like green, red, blue and yellow. You are more likely to have a red-green blindness and then the less common form is blue-yellow blindness. Beeing color blind does not mean that you will be seeing only grey and nuetral colors.
Color blindness happens when cells in your eye stop responding to colors as they normaly should.
There are more men affected by color blindness than women and you are normally born with it. Aging or disease can damge those cells in the eye and cause the color blindness later in life.
There is no cure for color blindness, but if you suspect you have problems in seeing colors or you notice any of your children or grandchildren having a problem you should see your eye doctor. When you do, they will use what is called Ishihara plates and should be able to determine the type and severity of the color blindness.