To learn more about the design of information graphics and maps that are accessible for color-impaired readers, please have a look at one of our articles:

Designing maps for the colour-vision impaired
Bernhard Jenny and Nathaniel Vaughn Kelso
Bulletin of the Society of Cartographers SoC, 41, p. 9-12, 2007.
Low resolution PDF (174 KB).

Color Design for the Color Vision Impaired
Bernhard Jenny and Nathaniel Vaughn Kelso
Cartographic Perspectives, 58, p. 61-67, 2007.
Low resolution for screen reading (706 KB)
High resolution for print (20.3 MB).