Designer and illustrator Geri Coady authored an interesting piece about designing for people who are colorblind on the web design blog 24 Ways to Impress Your Friends. Coady provides background about colorblindness and explains how it can affect the usability of various visual media such as websites, graphs, maps, and even video games. Coady also explores design solutions that can provide color accessibility.
Universal Design (UD) is an approach to design that increases the potential for developing a better quality of life for a wide range of individuals. It is a design process that enables and empowers a diverse population by improving human performance, health and wellness, and social participation (Steinfeld and Maisel, 2012). It creates products, systems, and environments to be as usable as possible by as many people as possible regardless of age, ability or situation.