Perception is the psychological process through which individuals organize and interpret sensory information to understand their environment. Vision is one of the most important sensory systems involved in perception, and depth perception allows individuals to perceive the distance, size, and three-dimensional nature of objects. The human visual system uses various cues to judge depth, among which monocular cues play a significant role. Monocular cues are depth perception cues that can be perceived using only one eye. These cues help individuals understand spatial relationships and perceive the world as having depth even when binocular vision is not available. One of the important monocular cues is linear perspective. It refers to the tendency of parallel lines to appear closer together as they move farther into the distance. For example, railway tracks appear to meet at a point on the horizon even though they remain parallel in reality. The brain interprets this change in the appearance of lines as an indication of distance, helping individuals judge depth. Relative size is another important monocular cue. When two objects are known to be similar in size, the object that appears smaller on the retina is perceived as being farther away, while the larger appearing object is considered closer. This cue helps people estimate the distance of objects in their