Prison glasses anyone?

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Anyone know where I can get a pair of those special spectacles that let you see at 90 degrees to the direction you're pointing at? I've heard them called "prison glasses" (presumably because inmates wear them so they can watch the door of their cell while pretending to be asleep :p ), but I think they're also called something else, just can't remember what.
 
Haha! Yeah you're right, it WAS prism glasses! :p

Might as well get me a prison hearing-aid while I'm looking! :D

DunK1 said:
That's the one! Now to froogle me up a store that sells them over here...

Christ! $39.99 over there, £89.99 over here! :/
 
they look like it'd be pretty easy to make your own.

cheap sunglasses - take out the lenses, tape a long thin mirror to the top and make a way of sitting it at the right angle. then turn whatever you're looking at upside down.

or would it still be back to front?
 
While on the subject of novelty spectacles, anyone know where you can get glasses that magnify, for TV watching etc???
 
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