So you want to interact with your computer using your eyes? The PCEye Mini has you covered. It is an eye tracker that lets you surf the web, play games, turn on the lights, and do everything else on your computer. You can attach and detach the device from your computer using a magnetic mounting bracket.
The PCEye Mini does all the processing, so your computer is not affected. It simply replaces your keyboard and mouse. More information is available here.