Hearing Disabilities
http://www.webaim.org/techniques/hearing/

WebAIM
2001

Abstract:

Most developers don't think about individuals who are deaf when they think of Web accessibility. For too many developers, Web accessibility consists of adhering to a few guidelines that ensure accessibility to screen readers for the blind. On one level, this is understandable. People who are blind will have the most trouble, since the Web is a visual medium...or is it?