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Has she ever been to a new generation 3D movie, or seen a 3d TV? I find the
brain has to work a bit initially to fuze the two images. Also, if one eye
is strongly dominant over the other she will have problems. It can improve
with practice: I had to learn to relax my eyes and let them focus
naturally. The more you strain the worse it gets.

Craig
On 2013-09-25 10:32 AM, "Philip Oshel" <[log in to unmask]> wrote:

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>
> Jeremy,
>
> What sort of optical tube arrangement do the stereoscopes she's tried
> have? Converging tube or parallel tube? If converging, that could easily be
> the problem - she can't cross her eyes to stay on the eyetubes' optical
> path.
>
> Phil
>
> On 09/23/2013 10:27 , Jeremy Sanderson wrote:
>
>> A PhD student who uses my facility complains that
>> she
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>>
>> Dear Listers,
>>
>> A PhD student who uses my facility complains that
>> she cannot fuse the two images seen through a binocular head into one
>> image.
>>
>> I have measured
>> her inter-ocular distance, and set this on the (Siedentopf) binocular
>> heads of
>> various microscopes. I have also checked which is her dominant eye and
>> asked
>> whether she has astigmatism, which she does not have. She is not old
>> enough to
>> suffer from presbyopia, but is myopic in both eyes (-2,5D) and so wears
>> contact
>> lenses.
>>
>> The strange thing is, she has absolutely no
>> problem with using binoculars or monocular spotting ‘scopes, just
>> binocular
>> microscopes. I’ve got her to use and adjust four different binoculars and
>> monocular telescopes, and she can see distant images perfectly with these
>> and fuse them into one field of view.
>>
>>
>> Can anyone shed any light on why this might be so?
>> This young lady has to use stereo-microscopes in her work, and we’re
>> struggling
>> to find answers to help her do this.
>>
>> Best regards,
>> Jeremy
>>
>>
> --
> Philip Oshel
> Microscopy Facility Supervisor
> Biology Department
> 024C Brooks Hall
> Central Michigan University
> Mt. Pleasant, MI 48859
> (989) 774-3576
>