Accessibility is not only for people who are blind or deaf. That’s not the case: Disabilities affect about 1 billion people worldwide, and people with disabilities access the internet in various ways. Some use a mouse and keyboard, while others navigate with a keyboard alone. Users with vision disabilities might use assistive technologies like screen readers and magnifiers. In contrast, people with mobility conditions might use head pointers, trackballs, or eye-tracking systems to control their web browsers.

You can also find articles about how to fix issues here

• Make your Word documents accessible to people with disabilities - Microsoft Support
• Microsoft Word Video Accessibility Training - Microsoft Support