![]() Linear perspective describes the tendency of parallel lines to appear to converge at the horizon. This shows that there are certain monocular cues ( described below) which allow you to perceive depth.īelow we look at some other ways that the perception of depth can be created. The fact that depth perception is possible with only one eye shows that there are other visual cues which allow us to perceive depth, and that this depth is not solely a result of retinal disparity. You can test this out for yourself right now by closing one eye and looking around you. This ability of the brain to merge two images together is sometimes called the “zipper effect”, and it is partly as a result of retinal disparity that the images we see appear to be in 3D. However, at the level of perception ( inside your head) we only perceive one image. Retinal disparity also provides another example of how the world of sensation differs from that of perception. For at the level of sensation ( i.e seeing through your eyes) we actually sense two images. Each eye captures a slightly different image, and the difference between these images acts as a cue for depth/distance. Since the pupils of the eyes are roughly about three inches apart, this means that the right eye gives a slightly different image to that of the left eye. The disparity ( difference) between these two retinal images ( retinal disparity) can be used as a cue for depth/distance. Binocular visionīinocular vision is vision with two eyes, and the main cue for depth perception associated with binocular vision is retinal disparity. This perception of depth is made possible by cues which provide the onlooker with various types of visual information. In addition to this, depth perception is also made possible by cues from binocular and monocular vision. Even though this painting is on a flat canvas you still perceive it in 3D. Even though just like the retina the canvas is flat, the picture still appears to have depth to it. ![]() The best way to approach this is by using the example of a painting on a flat canvas. So how does a flat surface give us the perception of depth? This is quite an interesting question if you stop to think about it, because although the eye itself may be a 3D ball, the retina is not, it’s flat. Depth perception is concerned with why we see objects in 3D rather than as flat, and how this is accomplished.
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