iPad Accessibility Features
http://help.apple.com/ipad/5/voiceover/en/iPad74ec1798.html

iPad incorporates numerous accessibility features, including:

• VoiceOver screen reader
• Zoom magnification
• Large Text
• White on Black
• Speak Selection
• Speak Auto-text
• Mono Audio and balance
• AssistiveTouch
• Support for braille displays
• Playback of closed-captioned content

Zoom, White on Black, and Mono Audio work with all apps.
Large Text works with Mail and Notes.
VoiceOver works with the built-in iPad apps, and with some third-party apps you can download from the App Store.
Closed-captioning works with videos and podcasts that support it.

For more information about the iPad accessibility features, go to www.apple.com/accessibility .
http://www.apple.com/education/special-education/

You can turn individual accessibility features on or off in Accessibility settings on iPad.
Go to Settings  >  General  >  Accessibility
You can also turn some features on or off in iTunes when you connect iPad to your computer.

Universal Access features
About VoiceOver
Triple-Click Home
Zoom
Large Text
White on Black
Speak Selection
Speak Auto-Text
Mono Audio
AssistiveTouch
Universal Access in Mac OS X
Minimum font size for mail messages
Widescreen keyboards
Closed captioning