How to Use Your iPhone’s Camera as a Magnifier in iOS 10
 

If you’ve ever found yourself wishing you had a magnifying glass with you, iOS 10 can now serve as an excellent replacement. The new Magnifier–not to be confused with the Text Size and Zoom features that makes your on-screen text bigger–uses your phone’s camera and flashlight to make sure you can always read that receipt or dig out that splinter.

http://www.howtogeek.com/272672/how-...ier-in-ios-10/