Depth perception is a term that refers to the subjective evaluation by humans of the distance between objects viewed with regard to their size and the planes they describe. It is the visual ability to perceive the world in three dimensions and the relative distance of an object.
Depth perception arises from a variety of depth cues. These are typically classified into binocular cues that are based on the receipt of sensory information in three dimensions from both eyes and monocular cues that can be represented in just two dimensions and observed with just one eye. Binocular cues include retinal disparity, which exploits parallax and vergence. Stereopsis is made possible with binocular vision. Monocular cues include relative size (distant objects subtend smaller visual angles than near objects), texture gradient, occlusion, linear perspective, contrast differences, and motion parallax.
Depth sensation is the corresponding term for animals since although it is known that animals can sense the distance of an object (because of the ability to move accurately or to respond consistently, according to that distance), it is not known whether they perceive it in the same subjective way that humans do.