Magnifier: Magnifier works like a digital magnifying glass. It uses the camera on your iPad or iPhone to increase the size of anything you point it at, so you can see the details more clearly. Use the flash to light the object, adjust filters to help you differentiate colors, or snap a photo to get a static close-up.
The Magnifier is a visual accessibility feature that essentially turns your iPhone or iPad into a magnifying glass.
- Launch the Settings app from your Home screen > Tap on General > Tap on Accessibility > Choose Magnifier > Toggle the option for Magnifier to “on.”
Once you’ve got Magnifyer enabled, this is how to use it:
- If you’re on using iPhone X, iPhone XS, iPhone XS Plus or iPhone XR, just triple tap the button on the right side of the phone. If you have an older iPhone, tap the home button three times to bring up the magnifying app. Use the slider to zoom in or out of text. Tap on the screen to focus, much like you would with the camera app. Tap the lock button to lock the focus in place, or use the filter button (the one on the bottom right) to apply various filters that might make it easier for you to read. Finally, tap the center button to capture a picture.
Source: https://www.razmobility.com/ios-built-in-accessibility/#learn-more