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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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> To join, leave or search the confocal microscopy listserv, go to:
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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