See 3D film with 3D glasses

With the onset of 3D TV it is likely that we will all put on a pair of 3D glasses in the near future, but what do they do and why do we have to wear them to watch 3D TV?

There are many different types of 3D glasses. The most common 3D glasses (the ones with red and blue lenses) produce a 3-dimensional effect through a process known as anaglyph color filtering. There are various other types of 3D glasses, but they all work in the same manner; by tricking the brain into seeing a 3-dimensional image from a 2-dimensional source.

The reason you need to wear glasses to watch 3D is that a separate image needs to be sent to each eye, with the brain combining the two images into a single image with 3D characteristics. In other words, the 3D process actually fools your brain into thinking it is seeing a 3D image, so it creates one for you