> Mike Horvath <mik### [at] gmailcom> wrote:
>> I still don't understand what is the difference between a cross-eye pair
>> and a parallel pair? Also, which should I be making for the glasses I
>> ordered?
>>
>>
http://www.amazon.com/gp/product/B004EDB1S4?keywords=stereoscope&qid=1452568122&ref_=sr_1_90&sr=8-90
>
> A parallel pair is when you have the left eye image on the left, and the right
> eye image on the right. If the separation is small, you can view these by
> looking 'through' them and resolving the 'third' image in between to get the
> stereo effect. This is what the viewing glasses use. This is also how dot
> stereograms or 'magic eye' pictures work.
>
> A cross-eye pair is swapped; the left eye image is on the right, and the right
> eye image on the left. These can be viewed by looking 'in front of' them, by
> going slightly cross-eyed to resolve the 'third' image in between to get the
> stereo effect. This can be easier than the parallel method, and is not
> restricted so much by image size / separation. I don't know if any devices exist
> to help viewing these.
>
> hope that helps!
> Bill
>
>
For the cross eyed view, there are devices that do exist, but they are 
bulkier and heavier as they rely on crossed periscope like setup.
They use 4 mirrors to swap the view points.

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