controlling the opacity of some glasses

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hi there,

i searching way build "glasses" in can control sight of people wearing them.
so want make them blind or seeing.

the point is, want them "wearable" or not tooo heavy use them in field.
not saying should "super small"... can fancy...

i did found interesting here:
http://www.instructables.com/id/arduino-based-shutter-glasses-of-fear-absgof/

what found interesting aswell use lcd-screens shown here in yt-video:
http://www.youtube.com/watch?feature=player_embedded&v=r01dyqib2nu
(just scoll end see result)

maybe use 2 small screens used or broke stuff/mobiles or ebay control opacity of glasses.

thx in advance help

you try kerr cells, may not power pack.


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