I've just been shown the most amazing technology I've ever seen. One of the brilliant engineers has developed a concept which will change the way screens work. This concept offers the ability to pick up reflections from the retina and determine where you are looking at a screen and operate buttons, sliders etc without even touching the screen! There are options for blinking, and long stares (the stares emulate a long press for dimming). i was blown away, especially when I was shown this in a DLT where the same concept was used behind the buttons. It's a little way off, but the prototypes are a good proof of concept.