How do those old red and blue movie theater Glasses make movie 3d? And are the new movie glasses similar do they do something different
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Your depth perception comes from the fact that your left eye doesn’t see the exact same thing as your right eye. So to create a 3D effect, you need to somehow show your two eyes a slightly different image.
The old way to do this was to have a red layer and blue layer on top of each other. The blue lens filtered out the blue layer for one eye, the red lens filtered out the red layer for the other.
Modern 3D glasses are a bit more high tech. The red and blue filters obviously mess with the colors of the movie. So new glasses flicker in sync with the screen. The right lens will go dark so only your left eye sees the screen. Then the glasses switches to the right eye and the screen switches to a slightly different perspective. Each eye still get a slightly different image, but colors are less messed up.
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