Human beings have a remarkable ability to make accurate judgments about distances, based on the images that form on the retina of the eyes. Specifically, humans can extract depth information from retinal images, which are typically two-dimensional (2D) or rather depthless (Blake & Sekuler, 2006; Eysenck, 2002; Snowden et al., 2012). However, it is important to note that the process of visual perception is much more complex in that 2D retinal images must be perceived as three-dimensional (3D) spatial representations (Barbato & Addington, 2013; Fischmeister & Bauer, 2006). In order to achieve this level of visual perception, the human visual system must receive and interpret information from different sources, including monocular and binocular depth signals. Depth cues or pointers are an important source of information, which allow the human visual system to reconstruct 3D images from flat or 2D retinal images (Blake & Sekuler, 2006; Fischmeister & Bauer, 2006). However, unlike other categories of cues, depth cues do not elicit any form of conscious deliberation for depth to be perceived, but rather the perception of depth occurs without any effort or thought (Blake & Sekuler, 2006 ). In fact, humans manage to accurately judge distances based on the coordination of depth information from various sources, which usually work harmoniously in such a way that they manage to create an unambiguous 3D image from flat 2D retinal images (Blake & Sekuler, 2006; Snowden et al., 2012). This essay seeks to precisely define the concept of depth perception and highlight the different sources of depth information, with particular emphasis on monocular and binocular cues to depth. Based on the following discussions...... middle of document ......bination. Journal of Vision, 4, 967-92. Lee, TS, Yang, CF, Romero, RD, & Mumford, D. (2002). Neural activity in early visual cortex reflects higher-order behavioral experience and perceptual salience. Nature Neuroscience, 5, 589-97. Sakai, K., Ogiya, M. and Hirai, Y. (2005). Depth and motion perception from ambiguous binocular information. Vision Research, 45, 2471-2480. Snowden, R., Thompson, P. and Troscianko, T. (2012). Basic Vision: An Introduction to Visual Perception. Oxford, UK: Oxford University Press. Sridhar, D. and Bedell, HE (2011). Relative contributions of the two eyes to perceived egocentric visual direction in normal binocular vision. Vision Research, 51, 1075-1085. Tsai, J.J. and Victor, J.D. (2005). Binocular depth perception from unpaired image points does not necessarily depend on scene organization. Vision Research, 45, 527-532.