Binocular cue - Depth cues, such as retinal disparity and convergence, that depend on the use of two eyes.
example: The retinas of both eyes have to work together while sending messages to the brain because of the differences in images.

Retinal Disparity - The differences between the images perceived by the retina of each eye, which provides an important cue to the relative distance of different objects.

example: As you can see in this image, the left eye shows the man further back as being in a different position relative to the man in the front.

Convergence - A neuromuscular cue caused by the eyes' greater inward turn when they view a near object.

example: The bug on the nose of the person in this image is very close to his eyes, causing convergence to occur in order to make the image clear.