Face ID image is blurred on my iPhone 13

Update to iOS 18, ensure the display is clear and any add-on screen-protective film is removed, restart, and test again.

If Face ID isn't working on your iPhone or iPad Pro - Apple Support

Then failing that, contact Apple Support: Official Apple Support

There may be something wrong with your TrueDepth camera. Please view the following articles. ⇢ 

If Face ID isn't working on your iPhone or iPad Pro - Apple Support

If an alert says Face ID has an issue on your iPhone or iPad Pro - Apple Support

If the above doesn’t help, please make a reservation at your nearest Apple Store Genius Bar or Apple Authorized Service Provider for diagnostics. ⇢ 

Genius Bar Reservation and Apple Support Options - Apple