On Apr 18, 12:13 am, "Ms.Brainy" <mikabra...[at]gmail.com> wrote:
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It would allow you to visually determing how far off the eyes are by
your trying to align the two grids. The grid spacing offset and the
distance to the grid would give the subtended angle.

Don W.

"Ms.Brainy" <mikabrainy[at]gmail.com> wrote in message
news:1176882888.376568.239490[at]n59g2000hsh.googlegroups.com...
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Because right now, one eye is so blurry that it doesn't compete.

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That muscle that keeps your lid "perky" has special innervation and it's
seldom affected by the same things that affect the extraocular muscles.

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Whether it resolves won't be affected by the prism.

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Movement of the IOL to or fro might affect the overall sphere power but it
should have little effect on your phoria.

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They do, and it's possible that you will have more problems _with_ the prism
than without it. No matter, the refraction should be completed again after
the surgery so you can ask to have the prism re-evaluated at that visit.

-MT

c-winer[at]hotmail.com wrote:
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http://www.sciplus.com/singleItem.cf...egory%20Filter
A cardboard toy for $0.95.
They may have other items.

Kevin

On Apr 15, 8:05 pm, "Mike Tyner" <mty...[at]mindspring.com> wrote:
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If I manage to overcome it, why do I need correction by a prism?

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I believe that some muscles have been affected by my retinal
detachment complex surgery (3 hours!). One of the consequences of the
surgery is a slightly droopy eyelid, which is characteristic to a
great number of people who undergo the procedure. Of course, this is
a visible muscle malfunction (no big deal, by the way), but I presume
that other inner muscles, invisible externally, could be affected as
well.
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How would it resolve itself if I am stuck with glasses with a prism?
Also, I read that in a cataract surgery the lens often moves slightly
forward or backward, which is one of the reasons the results are not
predictable. In this case, there will probably be a change in this
"phoria" business. Wouldn't it makes more sense then to have the
prism in the bad eye, which Rx is destined to be changed any way after
the cat surgery?

[I hope all these questions make sense... however I am still somewhat
confused as to the prism, phoria, etc,]
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On Apr 15, 5:00 pm, "Don W" <dwil...[at]prodigy.net> wrote:
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What insight would such items provide and how?

On Apr 17, 6:14 pm, c-wi...[at]hotmail.com wrote:
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You might try a Google search on:

red blue stereo glasses

Don W.

On Apr 15, 7:00 pm, "Don W" <dwil...[at]prodigy.net> wrote:
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Where can I find/buy these items?

winer[at]calumet.purdue.edu

"Ms.Brainy" <mikabrainy[at]gmail.com> wrote

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It's an indication of phoria, a muscle imbalance that you manage to overcome
when both eyes are open.

If you couldn't overcome it, you would see double, at which point it's
called a "tropia" because fusion is lost.

There are six muscles attached to each eye, and by "imbalance" we mean that
one muscle, or group of muscles, is overactive or inadequate, yielding a
tendency to point in a slightly different direction than optimal. There are
many causes, usually inferred from which muscle or muscles are involved, and
quite often requiring no treatment other than compensating prism.

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Indeed it does - even with one eye, when you focus on a very close object,
you're usually unaware that the background is blurry.

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Very likely.

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It's possible and it's a good justification for including prism.

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You have considerable reserves for compensating horizontally, so it takes a
lot of horizontal deviation to produce diplopia. By contrast, it only takes
a half-prism-diopter in the vertical direction to make some people complain.

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Just a guess - 60/40 if you have a vertical phoria now, the surgery won't
change it. Prettty often they resolve on their own, over time.

-MT

A pair of cardboard stereo glasses (red and blue filters) plus a
white on black Amsler grid may provide you with some insight to your
problem.

Don W.

On Apr 15, 4:10 am, "Mike Tyner" <mty...[at]mindspring.com> wrote:
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Thanks for the information. This prism really scares me. Presently
(with the cataract and my old glasses that hardly fit my increased
myopia in the bad eye) I have no dilopia, to the best of my judgment,
despite the great disparity between my eyes. However, the optometrist
showed me 2 squares which didn't seem to me to be on the same level
(first horizontally and then vertically), and he moved them till I saw
them on the same level. Was this an indication of diplopia?

I have read an interesting article (actually several articles) by Dr.
William Maloney, in which he contends that our brain naturally
hardwired for monovision, as opposed to multivision that does not
exist naturally. According to him our brain routinely ignores
unwanted images. Could it be that because of the present great
disparity between my 2 eyes my brain totally ignores the vision from
the bad eye and sees only the good eye image? [BTW, the only time my
bad eye seems to interfere is when driving at night or looking at
lights, due to the thick cataract.]
Could it be that with correcting my bad eye vision and bringing it
closer to the good I (but still with disparity), my brain no longer
ignores the bad eye image, resulting in diplopia?

MT, you stated that diplopia is due to muscle imbalance. Which
muscle? Can there be any other reason, e,g, the disparity between the
eyes?

Also, in my exam both the vertical and the horizontal didn't appear to
me to be on the same level, however the OD prescribed only vertical
prism. How come?

Most importantly, do you think that my cataract removal and IOL
implant will change this situation?