Apple have three ranges of handheld device - iPhone, iPod touch and iPad/iPad mini - which run the same software (the iOS operating system). This means they share a lot of the same features, including accessibility and an eBook reader app called iBooks.
Accessibility
The iPad, iPod touch and iPhone all come preloaded with the following accessibility functions:
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VoiceOver a screen reader.
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Zoom full-screen zoom magnification.
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White on Black, which inverts the screen colours.
A bluetooth braille display can be connected to these devices to give speech and braille ouput through VoiceOver.
An initial review of the iPad's accessibility can be found on the TechKnowMore blog.
Get Started with the iPhone: An Introduction for Blind Users is a useful publication available from RNIB. It focuses on the iPhone but much of it applies to the iPad and iPod touch.
iBooks
The first time you connect an iPad, iPod touch or iPhone to the App Store you are asked if you want to download iBooks, the eBook app. There is no version of iBooks for the Mac OS X operating system at the moment.
Benefits
As well as working with the accessibility features mentioned above, iBooks has the following benefits:
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12 font sizes, up to point size 40 approximately.
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Seven font options, including serif and sans serif.
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White, Sepia and Night (white on black) themes
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Screen brightness is adjustable.
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Content and menus accessible with VoiceOver for all books.
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Content can be navigated with VoiceOver in a number of ways such as by character or word.
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Content and menus accessible with White on Black and Zoom.
Obstacles
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No custom colour options except for highlighted text.