Use Talkback - Asus Nexus 7 Manual Book

Magnify: Triple-tap & hold.
Magnify & pan: Triple-tap & hold, then drag your finger.
Toggle magnification in or out: Triple tap & release.
While you're zoomed in, you can:
Pan: Drag two or more fingers across the screen.
Adjust zoom level: Pinch or expand using two or more fingers.

Use TalkBack

TalkBack provides spoken feedback to help you navigate your
tablet, describing what you touch and activate.
Note: Sighted assistance is needed for users with no vision to en-
able TalkBack if it wasn't turned on during the initial setup.
To turn TalkBack off or on:
1. Go to Settings > Accessibility > TalkBack.
2. Slide the TalkBack switch to the On or Off position.
3. Touch OK to turn on TalkBack.
4. When asked if you want to enable Explore by Touch, touch OK
only if you want to change the way your tablet works and have
your tablet describe each item that your finger moves over on
the screen.
When you turn on TalkBack, spoken feedback starts immediately.
As you navigate your tablet, TalkBack describes your actions and
alerts you of notifications and other occurrences.
If you also enabled Explore by Touch, moving your finger around
the screen triggers a description of each item it touches. Double-
NEXUS 7 GUIDEBOOK
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