Eye tracking is one of Apple's new iOS 18 features, designed to let iPhone users control their iPhone using just their eyes.
To set up Eye Tracking in iOS 18 and later, open the Settings app, tap Accessibility, then Eye Tracking, and turn on Eye Tracking.
Eye Tracking allows iPhone users to control their iPhone with their gaze and customize Eye Tracking in many helpful ways.
Here's how to turn on and use Eye Tracking on iPhone: Open Settings, tap Accessibility, tap Eye Tracking, toggle on Eye Tracking, follow the calibration process, and use the gaze to select areas on the screen.