3D glasses use polarized light to create the illusion of depth. A dual projector system displays two slightly different images simultaneously on the screen. One image is polarized horizontally for the left eye, and the other is polarized vertically for the right eye. The glasses contain polarization filters that allow each eye to see only its corresponding image.
Polarization is the key mechanism behind 3D glasses. Unpolarized light oscillates in all directions. When it passes through a polarization filter, only light waves oscillating in one specific direction can pass through. If horizontally polarized light encounters a vertical polarizer, it gets blocked completely. This selective filtering allows each eye to receive only its intended image.
立体视觉的形成过程基于双眼视差原理。每只眼睛通过偏振滤镜接收到略有不同的图像。左眼看到水平偏振的图像，右眼看到垂直偏振的图像。大脑处理这两个不同的视觉输入，并将它们之间的差异解释为深度信息，从而创造出三维感知效果。
There are two main types of polarization used in 3D glasses. Linear polarization uses horizontal and vertical orientations and is simple and cost-effective, but viewing angles are limited. Circular polarization uses left-handed and right-handed circular waves, providing better viewing angles and is commonly used in modern cinemas. Circular polarization allows viewers to tilt their heads without losing the 3D effect.
3D polarization technology has revolutionized visual experiences across multiple fields. In cinemas, systems like IMAX and RealD provide immersive movie experiences. The technology extends to 3D televisions, virtual reality systems, medical imaging for surgical planning, and scientific visualization. The key advantages include enhanced depth perception, immersive experiences, and wide compatibility across different platforms. This polarization principle continues to drive innovation in visual technology.