Phones use a special kind of camera called an infrared sensor that can see your face even in the dark. It takes quick pictures and does some math to figure out where your eyes are looking, if you're looking at the screen, it knows you're using it! Just like how your phone knows when you're smiling for a selfie.
Examples
- Your phone lights up as soon as you glance at it, just like it knows you're ready to talk.
- You’re watching a video on your phone, and it keeps playing because you're still looking at it.
- The screen goes dark when you turn away, the phone knows you're not interested anymore.
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