“If you hold a finger in front of your face and close first one eye then the other, you notice that the finger occludes different parts of the background in the two eyes. This is called lack of correspondence and takes a lot of brainpower. Thus, our eyes, spaced about six inches apart, provide slightly different information to our brains which then uses that disparity to calculate and perceive depth. The exact definition of stereopsis is “the ability to gain information about the 3D structure of visual scenes by comparing information collected separately and simultaneously from different lines of sight to the same region of space.” Other animals, humans being a prime example, can triangulate using the third method which is called stereopsis. Some animals appear to only be able to use triangulation when an object moves or when their own eyes move. As for triangulation, it can occur by (a) stationary eye(s) observing moving objects, (b) by moving eyes observing stationary objects or (c) by eyes spaced apart transmitting slightly different scenes to the brain. Triangulation: this provides depth cues by comparing views of an object from different locations.Īnimals use a combination of the three methods to perceive depth and distance. ![]()
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