Re: Free 3D Glasses at Wal-Mart
Those are polerized ones (Think Imax 3D), compared to the red/blue (also comes in red/cyan) which are called Anaglyph glasses, because of the technique used.
They both work the same way though.
The red blue glasses split the image the eyes see into 2, so that the brain is tricked into believing there is depth, and the polerized ones only let light in one way on one eye, so again, the brain is tricked.
Oh, and then there are shutter based glasses, that tend to just be for PC use, which does the same kind of thing, but the glasses are actually active, turning off one eye, and then the next in a repetitive way. The only down side to this is, the monitor has to be very fast at refreshing, because it has to refresh 2 frames (one left and one right) simultaniously for the glasses to pick up in sync.
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