HandiEye Pro is a hands-free ergonomic mouse replacement device. It allows
you to smoothly move the computer cursor simply by moving your head. When you
move your head HandiEye converts it into computer mouse movement.  

No need to stick dots or wear other gear on your head. HandiEye software is
comprised of sophisticated algorithms that recognize a human face and
precisely track its movements. Thus there is no need to stick dots to your
forehead. 

HandiEye camera contains built-in infrared LEDs, which enable HandiEye to
operate under any lighting conditions - including complete darkness. 

HandiEye camera has a convenient base, which can be use either as a stand or
as a clip: 

http://www.mousevision.com/assistech/products_handieye_pro.htm