Being colorblind does not necessarily mean that a person only has the ability to see black, white and shades of grey. While that is an actual and unfortunate level of colorblindness, it is rare.
The majority of people who suffer from colorblindness are unable to distinguish green, red or blue colors. These are milder forms of colorblindness and can also be referred to as color deficiencies.
Since many forms of colorblindness can be so mild, it is not irregular for a person to go through his or her entire adolescence without even noticing that what they were seeing in the crayon box, on the television screen, on clothes and in pictures was an incorrect perception of color!.