Adobe ACROBAT READER 7.0 Manual page 183

Using a screen reader
Adobe Reader supports assistive technologies that enable visually impaired users to
interact with computer applications, such as screen readers and screen magnifiers. When
assistive technologies are in use, Adobe Reader may add temporary tags to open PDF
documents to improve their readability. Use the Accessibility Setup Assistant to improve
how Adobe Reader interacts with the type of assistive technology you use. (See Setting
accessibility preferences.) You may also change your reading settings for the current
document when using a screen reader by choosing Document > Change Accessibility
Reading Options. (See Setting Reading preferences.)
Contact your vendor for more information about using a screen reader or screen magnifier
with Adobe Reader.