How to get your iPhone to turn on for a few minutes with your eyes closed

A new patent from Apple describes how a device with a screen attached to the back could trigger the iPhone’s camera to “see” for a short period of time if the user was concentrating on the screen.

The patent describes how the phone would “immediately” turn on if the screen was open, then lock it off again when it’s closed again.

The patented system could also use a motion sensor, which would measure the intensity of a user’s gaze and automatically turn the device on if it detected an increased focus or movement of the screen, such as moving objects.

In other words, you’d be able to use the iPhone to detect if you were focusing on the display and turn it on, without any need to press a button.

Apple has yet to make any announcements regarding the patent, which was first reported by The Verge, but it could be used to create a wide range of different features and services.

This article originally appeared on The Verge.