Depth perception involves interpretation of visual cues that indicate how near or far away something is.
	Two types of clues are used to make judgments of distance, monocular cues (clues from a single eye) and binocular cues (clues from both eyes together).
	The principal binocular depth cue is retinal disparity– objects within 25 feet project images to slightly different locations on the left and right retinas; thus each eye sees a slightly different view of the object.
	Monocular cues may involve feeling the accommodation or change in the shape of the lens as the eye focuses.
	Other monocular cues are pictorial depth cues– cues about distance that can be given in a flat picture, visually depicted on the next slide.