Complementing the PreyVisionCam (link), these goggles use image subtraction between successive frames.

The result is that only moving objects are visible, as is the alleged case for T. rice, according to the documentary "Jurassic Park".
-- MaxwellBuchanan, Dec 14 2012

PreyVisionCam PreyVisionCam
[MaxwellBuchanan, Dec 14 2012]

random, halfbakery