There are three basic ways for 3D
1. Storony mechanism. Came from Sony. The most expensive and heavy glasses. The idea is that the glasses are active. The left and right eye opens and closes with high frequency. Synchronizes with the TV (usually infrared). Accordingly, the TV shows the image for the left eye, then right. The frequency is high enough.
Pluses - all is well with the colour. The angle of view is almost not important.
Cons - expensive sunglasses, due to the closure of typically reduced brightness. Only works with Sony TVs (I do not remember that sold other brands).
2. The red-blue image. Sunglasses with colored glasses. Extinguishes one blue, the other red puts out, TV therefore produces two images, one with the more red, the other more blue.
Pros - cheap sunglasses. You do not need any special.technology, on any screen, you can give this picture.
Cons - poor color reproduction. Image quality also suffers.
3. Polarization - the most popular technology. There are even a few options (one is iMax). Glasses are not particularly expensive. The left and right lens with different polarization, the screen therefore produces two images.
Cons - the screen should be able to give out pictures with the desired polarization, and therefore, it is more expensive.
Pros - the glasses are extremely cheap, with colors all is normal.
Otherwise, the cost may depend on the lens material - plastic, film or glass.
Well, the rim - if diamond can and $ 1,000 cost. Otherwise the quality rarely changes.
The coolest mass implementation of 3d at the moment, the iMax, and there are points in General penny. Enough of them. So basically for polarizing glasses, the difference in comfort (frame, material of lens)