He has bad eyesight.
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No, however the two most popular 3D technology companies in the theaters are RealD and Master Image. So your glasses have to correspond to their format. I know a company, Visual World Products, that makes 3D glasses that work on both formats perfectly.
Diffraction glasses differ from traditional glasses because they use a special pair of lenses that offer light grating as an entertainment source. When viewing a light source the grating effect will break the light into a prism of colors, offering the user a unique experience. You can check out companies like GloFX to view the various glasses that will feature this special lens. They also have a great FAQ page about diffraction glasses, you can read up on it by searching GloFX Glasses What Are Diffraction Glasses.
The white people use the glasses to see and talk the evil spirits.
Many people use them to wear as nerd glasses, obviousley, but they are also recyclable.