If you believe the rumors, the successor to the Samsung Galaxy S3 (pictured) could scroll up and down based on your eye movements.

(Credit:

Josh Miller/CNET)

If the Samsung Galaxy S4 rumors pan out, Samsung's newest smartphone may let people interact with the screen using just their eyes.

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Eye-tracking uses the camera to lock onto the motion of a user's peepers, following wherever they move. With it, the phone can perceive where the user is looking, and can respond to a set of behaviors, let's say a very intentional movement to scroll a Web page up and down, or a long, purposeful blink to click.

If your eyes have reached the bottom of a page, eye-tracking software could automatically scroll you down the following paragraphs of text.

This type of technology -- which had been researched for desktop computing long before it was conceived of for the smaller smartphone screen -- has been demoed for a variety of actions: zooming in or out, pausing a video by looking away from a screen, and playing games.

One company, Umoove, has already posted a demo video on how different eye-tracking navigation could work (below).

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