PDF is a graphic file format that requires a plug in to be read. Screen readers, telephone browsers and other electronic Internet Agents cannot interpret PDF files. Otherwise, provide an e-mail or phone number for requesting accessible formats. Make sure your pages can be navigated by keyboard . Everyone does not use a graphical pointing device such as a mouse.
Some people use voice commands.
Some use a keyboard. Page Authors can help by using Client Side image maps with ALT tags, rather than Server Side Image Maps. See the Techniques for Web Content Accessibility Guidelines . Blind users find it difficult or impossible to navigate forms that have unlabeled elements. Avoid using Tables for Layout .