MOTION PARALLAX

    BINOCULAR DISPARITY

 

 

 

    OBJECTS

    BEHIND 

    FIXATION

 

Move in the same direction as you.

 

 

The further from fixation, the faster they move.

 

For any given distance from fixation, objects behind fixation move more slowly than objects in front of fixation.

 

 

Seen in uncrossed disparity, project to non-corresponding retinal points.

 

The further from fixation, the larger the angle of disparity.

 

For any given distance from fixation, objects behind fixation produce a smaller angle of disparity than objects in front of fixation.

 

 

    FIXATED

    OBJECT

 

 

Doesn’t move in the image (stays in the fovea.)

 

Is on the horopter.  No disparity, projects to corresponding retinal points.

 

 

 

   OBJECTS IN

   FRONT OF

   FIXATION

 

Move in the opposite direction from you.

 

The further from fixation, the faster they move.

 

For any given distance from fixation, objects in front of fixation move faster than objects behind fixation.

 

 

Seen in crossed disparity, project to non-corresponding retinal points.

 

The further from fixation, the larger the angle of disparity.

 

For any given distance from fixation, objects in front of fixation produce a larger angle of disparity than objects behind fixation.