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Stereoscopic 3D (S3D) is a method of giving depth perception that exploits the binocular disparity [[depth cue]] to produce the illusion of depth. It can be used in still or moving images. It produces an illusion of depth by displaying two slightly different images left and right eyes[[eye]]s.<ref name=”1”> Techopedia. 3-D Stereo Technology (S3-D). Retrieved from https://www.techopedia.com/definition/81/3d-stereo-technology-s3d</ref>. This ability is based on the characteristics of the human visual system.
The eyes, being positioned horizontally in the head, receive two views of the visual scene - one for the left-eye and another for the right-eye. The views overlap but differ slightly since they originate from two distinct perspectives. The visual system interprets and processes the information gathered from the two images to produce stereoscopic depth. The binocular system is very good at coordinating the movement of the eyes, which move constantly even during fixation. From a functional point of view, the images of both eyes fall on the fovea when fixating binocularly on a point. The fovea is the part of the back of the eye that has the highest acuity. According to Tam et al. (2011), “an object fixated binocularly is imaged on the same relative coordinates in the left-eye and right-eye views and it is perceived as a single percept, i.e., it is seen as a single object.” <ref name=”2”> Tam, J. A., Speranza, F., Yano, S., Shimono, K. and Ono, H. (2011). Stereoscopic 3D-TV: Visual Comfort. IEEE Transactions on Broadcasting, 57(2)</ref>