P3D Re: VM and Kids, inter

[Paul Talbot <ptww@xxxxxxxxx>]

Bruce Springsteen wrote:

> In my little experiment, restricted to the VM viewer, I observed that
> with my 70mm interpupillary I could still just see the full images
> abutting the outer edges of the circular lens openings.  [snip] 
> The question seems to have some urgency for those with especially
> small interpupillaries, adults or children, as they are likely to
> experience more discomfort or inability to view with the common
> systems.  I would be interested to hear Paul Talbot's experiences in
> this regard, as he has mentioned this difficulty from time to time.

I pulled out my standard-issue red VM viewer to supply the info Bruce
requests and find: a) wearing glasses: it requires quite a bit of care
to align the viewer with my eyes for maximum 3-D effect.  On several
"quick look" evaluations, I noticed I was losing about 1/3 of one of
the images.  Careful fine-tuning got it down to just some darkening
of two corners.  b) without glasses:  I *think* I can see all of
both images, but they are too blurry to really say for sure.

Note that when part of one image is cut off, it doesn't mean that I
see *zero* 3-D; it means part of the image is 3-D and part is not.
For something like an object poking through the *center* of a window,
I suspect the 3-D effect can be seen even with a very small IPD.  But
if the object were toward the side of the image, it could go in and
out of 3-D as the observer shifted the viewer side-to-side trying to
get the proper alignment.

Paul Talbot


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