==== head mounted displays ====
  * from 25 USD  http://jakeofalltrades.wordpress.com/2007/09/30/25-head-mounted-display/#more-112
  * or 250 USD http://www.i4u.com/article4612.html
  * eMagin http://www.vrlogic.com/html/emagin.html
  * Various http://www.yellomosquito.com/
  * Comparison http://www.stereo3d.com/hmd.htm#chart

==== eye mounted displays ====
  * http://www.eurekalert.org/pub_releases/2008-01/uow-clw011708.php


useful for [[mixed reality]] or [[virtual reality]] applications