Which statement is true about depth cues?

Which statement is true about depth cues?

• A. Monocular cues require two eyes
• B. Depth cues are not based on visual information
• C. Binocular cues require two eyes
• D. All depth cues require motion

Answer: (C)

Depth perception relies on cues that the brain uses to judge distance, and some of these signals come from both eyes while others can come from a single eye. The statement that is true is that binocular cues require two eyes. This is because these cues arise from two different viewpoints: retinal disparity, where each eye sees a slightly different image, and convergence, the inward turning of the eyes when focusing on a nearby object. The brain compares the two retinal images and uses their difference to estimate distance, a process that can’t be done with just one eye. In contrast, many depth cues can be gleaned with one eye alone—occlusion, relative size, linear perspective, texture gradient, and shading are classic monocular cues that still convey depth without requiring two eyes. Depth information is based on visual input, and while some cues involve motion (like motion parallax), others do not. So the requirement of two eyes is a defining feature of binocular depth cues.

Depth perception relies on cues that the brain uses to judge distance, and some of these signals come from both eyes while others can come from a single eye. The statement that is true is that binocular cues require two eyes. This is because these cues arise from two different viewpoints: retinal disparity, where each eye sees a slightly different image, and convergence, the inward turning of the eyes when focusing on a nearby object. The brain compares the two retinal images and uses their difference to estimate distance, a process that can’t be done with just one eye. In contrast, many depth cues can be gleaned with one eye alone—occlusion, relative size, linear perspective, texture gradient, and shading are classic monocular cues that still convey depth without requiring two eyes. Depth information is based on visual input, and while some cues involve motion (like motion parallax), others do not. So the requirement of two eyes is a defining feature of binocular depth cues.