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The iPhone has various accessibility options that make it easier to use if you have, for example, problems with seeing (vision) and hearing. In the iPhone Settings under Accessibility, the options are also subdivided into these two categories.
The following are the vision options.
With the VoiceOver function, you navigate through the iPhone menus by hearing them. The iPhone tells you aloud which menu items are available and what is currently activated. With this method you can operate the iPhone even if you cannot see what is displayed on the screen. The iPhone also tells you how VoiceOver works.
If this option is activated, the screen content is displayed in magnification. You can then use special gestures to zoom in further, zoom out, and navigate around the screen.