Colour blindness is a common impairment, affecting approximately eight percent of males and one percent of females. These individuals see a different range of colours.
Colour blindness can express itself in many variations and degrees of severity.
Colour perception problems are important considerations when developing web sites to ensure that all users have access to the content and the functionality of sites. Although there is no one right set of colours that will fit the needs of all individuals with all colour deficits, these guidelines will enable the majority of people with colour blindness to access the web sites. Color should never be the only visual cue for anything. Distinguish between features that a user must be able to see in order to use the web page and those that would be nice to see. Sufficient contrast for reading is a key factor when considering accessible colours on web pages.