Some depth perception cues include light and shade, fusion, aerial perspective and interposition, according to EyeHealthWeb. If a person doesn't see clearly with one eye, depth perception cues help her determine distance and size.
Doctors classify depth perception cues as binocular, monocular and inferred, which is a combination of monocular and binocular, EyeHealthWeb explains. Binocular depth cues rely on both eyes to focus on the same subject. One binocular cue is convergence, the ability of the eyes' extraocular muscles to help determine size and distance. Fusion is a cue in which the retinal displays come together to form one image.
Monocular depth perception cues enable people to use one eye to judge distance and size, EyeHealthWeb reports. Interposition occurs when objects overlap, while linear perspective perceives objects appearing progressively smaller as moving away. Light and shade refers to highlights and shadows, which help the eye perceive distance and dimension.
Addition monocular depth perception cues include aerial perspective and monocular movement parallax, EyeHealthWebcol states. Monocular movement parallax refers to relative velocity that a person perceives while moving the head from side to side. Objects farther away move with the head, while closer objects move opposite the head. Aerial perspective describes the blurred lines of an object as distant, based on scattered light, color and contrast.