Lecture 2 - Geometric Points/Horopter

Binocular vision plays a key role in _________ and ___________ perception.

direction; distance

Oculocentric Coordinates

coordinates specified with respect to a reference point in the center of the left or right eye

Egocentric Directions

in normal binocular vision, the perceived visual direction to objects results from combining oculocentric direction information

Egocentric Coordinates

describe the perceived direction and distance with respect to the body

Binocular Disparity

the differences between the two retinal images of the same scene

Uncrossed Disparity

a world-point farther than fixation is imaged at a location shifted nasally in both retinas

Crossed Disparity

a world-point nearer than fixation is imaged at a location shifted temporally in both retinas

Haplopia

occurs when oculocentric visual directions are the same or similar (single vision)

Diplopia

occurs when oculocentric visual directions are too different to fuse (double vision)

Geometric Corresponding Points

points in the two retinas associated with identical oculocentric directions (binocular disparity equals zero)

Geometric Horopter

an imaginary surface in the world that stimulates geometric corresponding points

Horizontal Horopter “Veith-Muller Circle”

surface for which horizontal visual angles along the horizontal meridians are the same in both eyes, forms a circle that intersects the optical centers of each eye

Empirical Corresponding Points

points in the two retinas that, when stimulated, result in the perception of the same visual direction