Users with Special Needs
http://infocentre.frontend.com/infocenter/articles/userswithspecialneeds.html

Frontend Infocentre
2006

Abstract:

Users with special needs who are not sufficiently visually impaired to require assistive technologies can still be frustrated by poor contrast, problematic colour schemes, or tiny, unreadable text. Up to 10% of men are colour blind to some extent, and the increasing number of older users are less likely to have 20/20 vision than those designing the pages.