Re: Approximating binocular monovision

[P3D Larry Berlin <lberlin@xxxxxxxxx>]

>Date: Wed, 27 Aug 1997
>From: P3D  Robert Linnstaedt writes:
>....................
>"...Maybe you could approximate the experience [A person without
> stereoscopic perception] by using...."
>
>1.  Hold your hand between your eyes, against your nose.
>2.  Check each eye to be certain their remaining fields of vision do not
>overlap.
>
> This merely approximates the effect of being without stereovision.  I did
>not find it dizzying, etc.  Just boring.  ;-)

******  I did think of this method, but a hand in front of my nose doesn't
cut off binocular vision. I tried two hands and that didn' t do it either.
finally with one hand and the thick part of my forearm did the trick. Yes it
is somewhat boring and not really dizzy-making. I wonder how good a
simulation that is though since my eyes are still used to fusing a common
scene and are therefore easy to aim in the same direction even when blocking
access to stereo. A true monosopic person may not have such common directed
eyesight.

>
>Now as to driving, stereovision is only of practical use in low-speed
>situations such as school zones and parking.  Above 25 mph, you will be
>traveling too fast to really get much benefit from stereovision.  Any object
>close enough to fall in front of stereoscopic infinity will get _flattened_
>by the time you notice it!  <g>
>

I heartily disagree with this. I can perceive stereo vision out to hundreds
of feet and even much farther. The detail may be reduced by the diminishment
of distance, but stereo vision is still present and very useful. I found
myself using it a lot during passing on narrow roads. Sometimes that's at a
slow speed (45 mph), other times it's much faster.

Larry Berlin

Email: lberlin@xxxxxxxxx
http://www.sonic.net/~lberlin/
http://3dzine.simplenet.com/


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