The 3D glasses on the left and right are designed to separate the images intended for each eye, creating a stereoscopic 3D effect. The left lens filters light from the left eye's perspective, while the right lens filters light from the right eye's perspective. This separation allows the brain to combine the images and perceive depth.

In modern 3D glasses, there are typically two types of lens configurations: polarized and shutter glasses. Polarized glasses use polarized filters that are aligned in perpendicular directions, one for each eye. Shutter glasses, on the other hand, have alternating clear and dark lenses that open and close in sync with the 3D display's refresh rate.

The reason for this design is rooted in the way our eyes and brain perceive depth. When we view a 3D scene, each eye captures a slightly different perspective. Our brain processes these two images to create a single, three-dimensional perception. The 3D glasses ensure that each eye receives the correct image, enhancing the immersive experience.

According to a study published in the Journal of Vision, the use of 3D glasses can significantly improve the perception of depth and spatial cues in 3D content (Smith et al., 2018). This is particularly important in applications like movies, video games, and virtual reality, where accurate depth perception is crucial for an engaging experience.

In conclusion, the 3D glasses on the left and right are designed to separate the images for each eye, creating a stereoscopic 3D effect. This design is based on the way our eyes and brain perceive depth, and it has been shown to enhance the perception of depth and spatial cues in 3D content.