Protect Apps from Deletion: If you share your iPad with other users, you may want to protect apps (along with all their data) from being accidentally deleted. You can do this with device Restrictions. Access it by launching the Settings app > General > Restrictions. Enter a passcode to Enable Restrictions, then set the Allow: Deleting Apps switch to OFF.
White on Black: Use White on Black to invert the colors on the iPad display, which may make it easier to read the screen. When White on Black is turned on, the screen looks like a photographic negative. To invert the screen's colors go to iPad Settings, choose General > Accessibility, then tap “White on Black.”
Zoom: This feature lets you magnify the entire screen to help you see what’s on the display. Turn Zoom on or off: In Settings, choose General > Accessibility > Zoom, then tap the Zoom On/Off switch. To Zoom in or out: Double-tap the screen with three fingers. Move around the screen by dragging the screen with three fingers while zoomed in.
Scroll to top: Tap the status bar (where time and battery life are displayed) to automatically scroll to the top of the corkboard or outline