Chapter 18. PDFs and Accessibility
What is PDF accessibility, and why should it matter to you?
Accessible PDFs are PDF files that can be read by screen readers—programs designed to assist people who are vision and motion challenged. These special programs read aloud documents via controls a user activates with keystroke commands. Such controls may include character by character reading, pausing, stopping, and various audible controls. Accessible files are structured in such a way that the contents can be read by a screen reader in a logical reading order such as column by column reading as opposed to reading horizontally across pages.
You can't create accessible PDF files using Adobe Reader, but you can interpret and read them using various software ...