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DEPTH CUES Are sources of information from the environment (external cues) or from within our body (internal cues) that help us to perceive how far away object are and therefore to perceive depth.
PRIMARY DEPTH CUE Cues from the 3D environment only. They tell us where objects are and help us judge distances.
SECONDARY DEPTH CUE Cues from the 2D environment, they include linear perspective, relative size, height in the visual field, interposition and texture gradient.
BINOCULAR DEPTH CUE (BDC) Require the use of both eyes working together in order to provide information to the brain about depth and distance. They are important in determining the distance of object that are relatively close.
BDC - CONVERGENCE Involves the brain detecting and interpreting depth or distance from changes in tension in the eye muscles that occur when the two eyes turn inwards to focus on objects that are close.
BDC - RETINAL DISPARITY Refers to the very slight difference ('disparity') in the location of the visual images on the retinas which enables us to make judgements about the depth or distance of an object.
MONOCULAR DEPTH CUE (MDC) Require the use of only one eye to provide information to the brain about depth & distance, they also operate with both eyes. Most depth cue are monocular so we can still perform many of our daily activities without difficulty if we lose vision in one eye
MDC - ACCOMODATION Involves the automatic adjustment of the shape of the lens to focus an object in response to changes in how far away the object is.
PICTORIAL DEPTH CUE (PDC) Are so named because artists use them to create depth and distance on two dimensional surfaces such as paper and canvas.
PDC - LINEAR PERSPECTIVE The apparent convergence of parallel lines as they recede into the distance.
PDC - INTERPOSITION Also called overlap, occurs when one object partially covers or blocks another, and the partially blocked object in perceived as further away than the object that obscures it.
PDC - TEXTURE GRADIENT Refers to the gradual reduction of detail that occurs in a surface as it recedes into the distance, compared with a surface that is close and perceived in fine detail.
PDC - RELATIVE SIZE Refers to the tendency to visually perceive the object that produces the largest image on the retina as being closer, and the object that produces the smallest image on the retina as being further away.
PDC - HEIGHT IN THE VISUAL FIELD Refers to the location of objects in our field of vision, whereby objects that are located closer to the horizon are perceived as being more distant than objects located further from the horizon.
Created by: ebony.odonohue