4/30/2023 0 Comments Binocular cue![]() ![]() Accommodation: The process by which ciliary muscles change the focal length of the eyes so that the image is clearly formed on the retina is called the accommodation of the eye.The more your eyes turn inward or converge the nearer the objects appear in the space. Some muscles in our eyes send signal to the brain regarding the degree of convergence and our brain interprets it as a cue for depth perception. Convergence: when we see a closer object our eyes turn inward or converge, so that the image is formed on the fovea.This difference in the images of two eyes is retinal disparity. Because of this distance between two eyes the images formed on retina of a same object is slightly different. Retinal or binocular disparity: Humans have two eyes which are horizontally separated by a distance of 6.5 centimeters.The following are the important and interesting binocular cues: ![]() They are important visual depth cues in three dimensional spaces. These are the cues that are provided by both the eyes working together. The distant object appears to move slowly than the objects that are close. Motion parallax/ Movement: This cue occurs when the objects are in motion.Relative height: We perceive large objects to be closer to us and smaller objects to be farther away.Therefore, if we see details of an object we perceive it closer. For example, on a hazy day a distant mountain would appear far away than on a clear day, because haze blurs the fine details. Clearness: The more clear the object the nearer it seems.The object that is completely visible seems to be nearer and the object that is partially visible seems to be farther away. Interposition or overlapping: This monocular cue occurs when one object covers the other.It says that the distant between two objects far away appear to be smaller than what the distance actually is. Linear perspective reflects this phenomena. You would see that the rail track become smaller and smaller, until there is a point where they meet each other. ![]()
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