Before you can get started, though, you need to do a one-time calibration process, which involves following a circle moving around the screen.

ENGADGET: Hands-on with Tobii REX, a peripheral that brings eye-tracking to any Windows 8 PC (video)

There's some calibration involved when moving from person to person, chasing a circle around the screen with your eyes.

ENGADGET: Haier's Eye-Control TV set, we go eyeballs on (video) HD

We did notice that the screen had a much warmer look to it, but we're told that the color-calibration is still being worked out.

ENGADGET: LeapFrog LeapPad 2 and Leapster GS Explorer hands-on (video)