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P3D depth perception cues


  • From: Peter Abrahams <telscope@xxxxxxxxxx>
  • Subject: P3D depth perception cues
  • Date: Tue, 09 Mar 1999 20:27:19 -0800

>convergence is a "minor" cue for depth perception. ... implies that the
ability of humans to judge
>absolute depth by binocular stereo in the absense of other visual references
>is not very good.

Binocular stereo is based on the disparity between what the right & left
eyes see of the object, and convergence is sometimes a minor assist.  What
am I missing here?

>I can think of a possible way to test it - when viewing a monochromatic
>"point" light source (of adjustable brightness) in otherwise total darkness, 
>sufficiently far away that accommodation doesn't provide a good cue, and
with 
>the test subject not allowed to move their head, then convergence should be 
>just about the only cue, and the accuracy in judging distance can be
>evaluated.

If it's far enough that accomodation isn't a cue, then convergence will be
at its far limits as well (I speculate). 
Convergence & accomodation together probably have greater sensitivity than
either one alone. Slight mismatches certainly set off alarms in the brain,
or cause objects to appear bigger or smaller than they are.
_______________________________________
Peter Abrahams   telscope@xxxxxxxxxx


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