Re: weighting depth clues

[T3D Jim Crowell <crowell@xxxxxxxxxxxxxxx>]

Richard Young wrote:
[snip]

>I recently asked my colleague Gerald Westheimer at Berkeley "Why 3D?"
>Here is his reply:
>
>>There was an article the other day in the newspaper about a pilot who had an
>>accident and it was revealed that, contrary to regulations, he was wearing
>>some kind of contact lens correction.  I read that to mean that he was, as
>>some vain people do, wearing a contact lens for reading correction in only
>>one eye, leaving the other for distance vision.  This seriously impairs
>>stereopsis (Suzanne McKee and I wrote a paper on that in JOSA about 1980).

Sure, but that's not all it would disrupt...I'll have to look at that
paper, I find it very hard to believe that stereo is important for
flying...except maybe in the cockpit, perhaps the guy reached for the
throttle & missed?

>>   incidentally, about 98% of college biology students have acceptable
>>stereopsis and 3-D is an exceedingly good tool for demonstrating molecular
>>structure.  More people have full stereoptic capability than full color
>>vision!

That's interesting.  I wonder if that means there's actually a difference
between college students & others or if it's a criterion effect?  i.e.
there are probably degrees of stereoblindness, maybe the 7% figure was
arrived at by placing the dividing line at a different point...

-Jim C.


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