These images flip back and forth faster than the human eye can perceive. ![]() Then, when the image for the right eye is displayed, the left lens will darken and the right lens will become clear again. When the screen displays the image for the left eye, the right lens will go dark so that only the left eye can see it. Instead of having two slightly different images displayed simultaneously and filtering one to each eye, like passive glasses do, shutter glasses make each lens go opaque and then transparent again in sync with the images displayed on the screen. Shutter glasses take more of a brute force-approach to create 3-D content. Most TV manufacturers are selling shutter glasses for 3-D TVs at over $100 each. The most recent type of 3-D glasses, called shutter glasses, is also controversial for being the most expensive. Nicer polarized glasses can run anywhere from just a few dollars to $20. ![]() While it's common to have simple plastic frames, theaters can even mount the polarized lenses in cardboard frames just like anaglyph glasses. In addition, the glasses themselves are relatively cheap to make, too. For this reason, polarized 3-D glasses are the technology of choice for most 3-D content in movie theaters.
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