A selection apparatus including a display unit for indicating a plurality of displays on the same screen, a line-of-sight position detecting unit for detecting a line-of-sight position of an operator on the screen, and an input unit through which the operator inputs an instruction, the input unit operating...http://www.google.com/patents/US6424376?utm_source=gb-gplus-sharePatent US6424376 - Selection apparatus using an observer's line of sight
