horizontal field of binocular foveal non-saccadic view

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Bob - 18 Apr 2007 17:11 GMT

Please point me at recent literature on this topic.

B.H.

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otisbrown@pa.net - 19 Apr 2007 02:21 GMT

Sure, Bob.

You might read Dr. George Hung's book on these
various subjects:

http://www.worldscibooks.com/engineering/4652.html

> Please point me at recent literature on this topic.
>
> B.H.

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Dr Judy - 19 Apr 2007 03:05 GMT

> Please point me at recent literature on this topic.
>
> B.H.

Graefes Arch Clin Exp Ophthalmol. 2005 Mar;243(3):210-6. Epub 2004 Sep
10. Links
Integrated visual fields: a new approach to measuring the binocular
field of view and visual disability.Crabb DP, Viswanathan AC.
School of Science, The Nottingham Trent University, UK.
david.crabb@ntu.ac.uk

BACKGROUND: We have developed a method of quantifying the central
binocular visual field by merging results from monocular fields
(Integrated visual field). This study aims to compare the new measure
with the binocular Esterman visual field test in identifying patients
with self-reported visual disability. METHODS: Forty-eight patients
with glaucoma each recorded Humphrey 24-2 fields for both eyes and an
Esterman on the same day, and each completed a binary forced-choice
questionnaire relating to perceived visual disability. Computer
software merged sensitivity values from monocular fields to generate
an integrated visual field and a related score of the number of
defects at the <10 dB and <20 dB level. Receiver operating
characteristic (ROC) analysis was used to compare the integrated
visual field score and the Esterman disability score with individual
responses to the questions on perceived difficulty with visual tasks.
RESULTS: Comparison of areas under ROC curves revealed that a score
based on the integrated visual field was generally better (median
area: 0.79) than Esterman scores (median area: 0.70) in classifying
patients with or without a self-reported perceived difficulty with
visual tasks. CONCLUSIONS: The integrated visual field offers a rapid
assessment of a glaucoma patient's binocular visual field without
extra perimetric testing. As compared to an actual binocular field
test (Esterman), the integrated visual field provides a better
prediction of a glaucoma patient's perceived inability to perform
certain visual tasks.

PMID: 15806374 [PubMed - indexed for MEDLINE

Go to PubMed, type in the PMID number in the search field. When you
find the article, click on related links for more.

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Bob - 19 Apr 2007 09:36 GMT

Thank you.

I am especially interested in statistics on the width of both the
foveal field and
the zone between the foveal field and the perimetral field where loss
of resolution
begins.

B.H.

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Dr Judy - 19 Apr 2007 15:10 GMT

> Thank you.
>
[quoted text clipped - 5 lines]
>
> B.H.

Don't know if you will find that as a binocular measure. More likely
to find monocular measures, and they will likely be measures of
relative receptor density not measures of field. You can certainly
find acuity measures as a function of distance from central fixation,
if your interest is in resolution as opposed to field of view. Try
using search terms like "photo receptor density" and "acuity with
eccentric viewing".

I'm not sure how you would measure the macular field width other than
with very dark red targets that would not be visible to the rods, and
have no ideas about how to measure the size of the transtion zone
field, how you would define the zone and how you would know you were
measuring it.

Dr Judy

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Bob - 19 Apr 2007 18:07 GMT

> Don't know if you will find that as a binocular measure. More likely
> to find monocular measures, and they will likely be measures of
[quoted text clipped - 3 lines]
> using search terms like "photo receptor density" and "acuity with
> eccentric viewing".

In absence of data, monocular would do.

> I'm not sure how you would measure the macular field width other than
> with very dark red targets that would not be visible to the rods, and
> have no ideas about how to measure the size of the transtion zone
> field, how you would define the zone and how you would know you were
> measuring it.

By cross-correlation with density of cones on the retina.

B.H.

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Don W - 20 Apr 2007 03:14 GMT

> > Don't know if you will find that as a binocular measure. More likely
> > to find monocular measures, and they will likely be measures of
[quoted text clipped - 15 lines]
>
> B.H.

I am assuming you are famliar with some of the work that Thibos,
Indiana University, has done. One for instance is:

http://research.opt.indiana.edu/Library/ModelOffAxisI/ModelOffAxisI.html

but he has done many papers in the peri vision area.

Don W.

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