Human vision, visual correction, and visual science

Archive for January, 2011

did they screw up my surgical loupes?

I just ordered and received a pair of surgical loupes.

It looks like this:
http://img.alibaba.com/photo/11292684/High_Resolution_TTL_Through_The…

Aren’t the telescopic lenses supposed to be centered on the pupils?

I looked in the mirror ( with loupes on ) and I’m noticing how the
lenses are a bit closer to my nose instead of being fully centered on
my pupils. Both lenses are in the medial direction rather than being
fully centered on the pupils.

Are they supposed to be like this intentionally? Will I ever become
cross-eyed from using these loupes?

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Welcome to sci.med.vision (7/14)

Executive summary by Bev:

                             There are a number of people here
                             with no medical credentials at all and a
                             lot of opinions bordering on religious
                             belief. The people trying to promote the
                             Bates Method, "The Plus" lens and pinhole
                             glasses are examples of this behavior.

                             Before acting, do some research.
                             —————————————–

Please do not post comments and discussion under this
subject. PLEASE take your posts to other existing threads
or start one with a new subject line. This notice is posted
weekly on Monday (mostly!).

                          WELCOME TO THE SCI.MED.VISION NEWSGROUP

The purpose of this newsgroup is to discuss issues related to
eye health and vision care from a scientific viewpoint.
Issues for discussion include (but are not limited to): how
the eye works, vision problems and how they may be corrected,
eye health concerns, how they happen and how they may be
remedied, as well as items related to new research and
associated findings.

This group is the place to learn about these issues and
readers are advised that opinions expressed here may come
from eye care professionals (optometrists, ophthalmologists,
opticians, ophthalmic researchers) as well as the general
public.

 From time to time we experience posters who espouse certain
viewpoints that are hoaxes, mythology, disproven theories and
outright scams. If someone is desperately trying to convince
you of something or uses demeaning and abusive language, you
might be correct in assuming that they have an agenda and
their views are not consistent with current science.  If it
sounds too good to be true, it probably is. The people trying
to promote the Bates Method are one such example of this
behavior.

When reading and gathering information, be aware of the
source and use good judgment. Do not base vital health care
decisions on information obtained in this forum without
consulting a practitioner who can clearly understand your
issues and examine the situation first hand, in person.

Please do not reply to posters in an effort to denounce,
ridicule, embarrass or otherwise engage in non-productive
discussion. That’s called "feeding the trolls" and wastes
space on hundreds of thousands of newsserver hard drives and
personal computers around the world.  If you are bothered by
the tone or content of a thread, don’t read it or learn how
to make the subject or author not appear in the list of
topics. This is called kill-filing or filtering.  For more
information on how to set up filters and kill-files, please
see the documentation for your newsreader application or go
to:

      <http://www.hyphenologist.co.uk/killfile/killfilefaq.htm>

For additional information, the official sci.med.vision FAQ
(last updated in 1997) can be found at:

      <http://www.faqs.org/faqs/vision-faq/>

Thank you for participating in our unmoderated open forum.

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Spams!

I noticed, there is lots of spams again on the forum. Is not there
something we can do to stop it?

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RGP Material

I wore Fluroperm 151 RGP lenses from 1995 until last year when an
optometrist recommended that I switch to O2Optix lenses.  He said that
I would see better with an aspheric design lens.  Although I had less
of a problem with dust while wearing the larger soft lens, I think my
vision was clearer with the RGP lens.  For me, I’d rather put up with
some minor occasional discomfort in order to see better.  (Plus the
RGPs are more economical and I can sleep with them in.)

Are there any new RGP materials that allow more oxygen to get to the
cornea than the Fluoroperm 151s?  Are there any other reasons to
switch from Fluoroperm 151 to a different RGP material?

Bob Simon

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The Donald Korb Award for Excellence in Optometry

News Item:

 "Robert B. Mandell, OD, PhD

and Kenneth A. Polse, OD, MS

(along with Richard M. Hill, OD, PhD; Ohio State University College of
Optometry)

will each receive the Dr. Donald Korb Award for Excellence.

All are well known for their groundbreaking research in cornea,
contact
lenses, and oxygen requirements."

http://spectacle.berkeley.edu/opt_txtpp/news_info/newsspotlight.html

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Better Eyesight Magazine, Volume 10

http://s4.turboupload.com/file/2099026359/BEMVol10.doc

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Optic Neuropathy and Erythrocytosis

"Hyperviscosity syndrome"

Simultaneous, Bilateral Anterior Ischemic Optic Neuropathy (AION) in
Polycythemia Vera: a Case Report

Gleichzeitige, bilaterale anteriore ischämische Optikusneuropathie
(AION) bei Polyzythaemia vera: eine Falldarstellung

M. S. Tönz1, V. Rigamonti2, M. E. Iliev1
1 Department of Ophthalmology, University of Bern, Inselspital, Bern,
Switzerland
2 Department of Hematology, University of Bern, Inselspital, Bern,
Switzerland

Abstract
Background:
Polycythemia vera (PV) is a hemopoetic disorder. Apparently, although
thrombosis accounts for the majority of morbidity, AION has not been
associated with PV so far.
Patient and Findings:
A 63y-old woman with PV was hospitalized because of acute liver
failure. She also experienced bilateral painless loss of vision.
Bilateral, pale optic disc swelling with flame-like hemorrhages, more
pronounced in the right eye, constricted visual fields, and relative
afferent papillary defect (RAPD) on the right side were present.
Computer tomography scan revealed no signs of intraorbital pathology,
elevated intracranial pressure or hemorrhages.
Clinical course:
We interpreted the findings as AION associated with the hyperviscosity
syndrome. Liver transplantation had to be carried out in the next
days. Three weeks later, vision improved slightly, but RAPD persisted,
and disc pallor developed in both eyes. The patient died two months
later.
Discussion:
Central retinal artery and vein occlusions have been described as
complications of Essential thrombocythemia, but not of PV. We observed
a rare case of bilateral neuropathy suggestive of AION. This condition
has so far not been associated with PV.

Schlüsselwörter
bilaterale AION – Polyzythaemia vera – Papillenödem – Hyperviskosität
– N. opticus – Thrombose

Key words
bilateral AION – polycythemia vera – disc swelling – hyperviscosity –
optic disc – thrombosis
Kasuistik
 Klin Monatsbl Augenheilkd 2008; 225: 504-506
DOI: 10.1055/s-2008-1027304

© Georg Thieme Verlag KG Stuttgart · New York

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