The size of the retinal image is normally larger for nearby objects than for distant ones. In the figure, the lack of details of the bird in the distance shows the aerial perspective. A mountain, a building, or any object which is nearby is seen in greater detail than the more distant objects because of the atmospheric condition, is the aerial perspective. Since light scatters as it passes through space and especially through moist or polluted air or the haziness, objects at greater distances appear fussier than those nearby. The figure depicts the convergence of the lines of the walkways surrounding the water as it approaches the Taj Mahal. Railroad, telephone poles, trees, and other objects decrease in size and railroad tracks coverage, as they are farther away from us. The decrease in size and in the separation of the object as they become more distant is known as linear perspective. In the figure, the trees blocking the sidewalk and the front of the building, elevation. When one object blocks the path of another, the blocked object is perceived as more distant. There are different monocular cues to perceive depth and distance perception. Monocular cues are seen by one eye alone. Monocular cues can be defined as the ability to see the depth of the world by using one eye. This difference in the two views is referred to as retinal disparity, the closer the object is to the viewer the greater the disparity. The right eye sees more of the right side of an object, the left eye sees a bit more of the left side.
Retinal Disparityīecause our eyes are about 2*1/2 inches apart our retina receives slightly different pictures of the same object or situation. Convergence cue is more kinesthetic than visual because it is produced by muscle movement in the eyes. In convergence, the eyes turn inward, when we focus on nearby objects than on distant ones. When we look at the objects nearby, the eyes rotate inward toward a center point. These muscles also provide feedback for judging distance. When we look at something our eye muscles move the eyeball to allow us the view. Convergence and retinal disparity are the two binocular cues: Convergence In other words, binocular cues are the ability to perceive the world in 3D by using both eyes. The stimuli can only be perceived clearly by using both eyes.
Binocular cues require visual input integrated from the two eyes for depth perception.
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