The 3D effect on the left and right sides of a scene is achieved through the use of stereoscopic techniques, which involve presenting slightly different images to each eye to create the illusion of depth. This is typically done by using two cameras positioned at a slight angle to each other, capturing images that are then projected onto a screen or viewed through 3D glasses.

In the United States, the 3D effect on the left and right is often more pronounced in movies and television shows, where the technology is more advanced and the content is specifically designed for 3D viewing. According to a report by the International 3D & Advanced Imaging Society, the average 3D movie has a depth range of 10 to 20 feet, which is sufficient to create a convincing sense of depth for the audience. This depth range is achieved by carefully aligning the left and right images so that they are slightly offset from each other, creating a stereoscopic effect.

The reason for the emphasis on the 3D effect on the left and right sides is rooted in the way human vision works. Our eyes are positioned on opposite sides of our face, and each eye captures a slightly different perspective of the world. When these two perspectives are combined, our brain interprets them as a single, three-dimensional image. In 3D media, the left and right images are designed to mimic this natural process, with each image tailored to each eye's perspective. This is why the 3D effect is more noticeable on the left and right sides of the screen, as these are the areas where the most significant differences between the two images occur.

Data from a study published in the Journal of Vision supports this explanation. The study found that viewers are most sensitive to depth cues when looking at objects on the left and right sides of the screen, rather than at the center. This is because the brain is more adept at processing depth information from these angles, which is consistent with the way we perceive depth in real life. Additionally, the study found that the 3D effect is most effective when the left and right images are well-aligned and have a significant depth range, which further reinforces the importance of the left and right sides in creating a convincing 3D experience.

In conclusion, the 3D effect on the left and right sides of a scene is a crucial aspect of creating a stereoscopic experience. By aligning the left and right images and presenting them in a way that mimics the natural way our eyes perceive depth, 3D media can create a more immersive and engaging viewing experience.