The American with Disabilites Act extends beyond architecture to include how people will use the architectural environments, including museum exhibits. Below is a listing of Museum Accessibility Standards and Guidelines
In the USA the National Park Service Guidelines are often used as the highest standard of accessibility compliance.
Americans with Disabilities Act (ADA)
Web Content Accessibility Guidelines (WCAG) 2.0
Smithsonian Guidelines for Accessibility
UN International Accessibility Standards
Universal Design: Process, Principles, and Applications by Sheryl Burgstahler, Ph.D.
The Principles of Universal Design by The National Institute on Disability and Rehabilitation Research