RE: [photo-3d] Re: 3d vision again

["Gabriel Jacob" <gjacob@xxxxxxxxxxx>]

I wrote:
>>Actually, the moment you are born you don't see 3-D. You
>>don't even see 2-D very well either! Surprisingly, the brain is
>>not hardwired at birth for (clear) vision. It is a learned trait, that
>>takes many months (if not years) of actual brain development,
>>before an infant can see well and make any sense of the
>>chaotic imagery around them.

Bob Maxey writes:
>I would like to know where the data comes from. Please point me in a
>direction. I still maintain that the ability to view 3D is one of natures
>miracles and I would go so far as to say that NOT being able to see 3D is
>extremely rare.

Checking the net for a reliable source I found this web page,
http://instruction.ferris.edu/cronm/visdev.html
The author is a licensed optometrist.

>One thing I find interesting is how much stereo vision might vary from
>person to person. For lack of a technical term, do some of us see stereo
>at 100%, some at 95%, some at 96%.... I would bet that there are
>differences.

Yes, there is varying degrees of stereo vision. A few years back I ran
across an interesting web page that described a test to determine this.
They used a series of magic-eye pictures with progressively shallower depth
cues,  to determine the varying depth perception of individuals. I don't
have
the web site bookmarked but maybe I can still find it (or someone else
maybe can give a pointer to it, it was a Canadian web site).

> I think there is indeed some time required for the brain and eyes to work
>together, but still, it would surprise me to learn, as one poster posted,
>that we do not see 3D from the beginning. I think we do.

The studies show that we are born with only very basic vision at birth, it
would seem very unlikely that we can perceive depth (an advanced form of
perception) until later.

Gabriel