depth perception - binocular cues

• Convergence


  -       in order to see close objects, our eyes turn inward, toward one another

  -       the greater this movement, the closer such objects appear to be

  -       the brain can use the angle of convergence as a cue to how far that object is (the larger the angle, the nearer the object)
• Retinal Disparity (Binocular Parallax)


  -       our two eyes observe objects from slightly different position in space

  -      the difference between those two images is interpreted by our brain to provide another cue to depth