11
Eyegaze
• control interface by eye gaze direction
– e.g. look at a menu item to select it
• uses laser beam reflected off retina
– … a very low power laser!
• mainly used for evaluation (ch x)
• potential for hands-free control
• high accuracy requires headset
• cheaper and lower accuracy devices available
sit under the screen like a small webcam
Cursor keys
• Four keys (up, down, left, right) on keyboard.
• Very, very cheap, but slow.
• Useful for not much more than basic motion for text-
editing tasks.
• No standardised layout, but inverted “T”, most com mon
Discrete positioning controls
• in phones, TV controls etc.
– cursor pads or mini-joysticks
– discrete left-right, up-down
– mainly for menu selection
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