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Medical Forum / General / Vision / May 2006

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Strange worsening and return of vision

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norman_conway@yahoo.com - 02 May 2006 20:48 GMT
I had something happen to me a few months ago that I am completely
unable to understand. I'm mildly farsighted (about +1 in both eyes,
with an add of 2 and  some cyl for astigmatism), and wear a combination
of glasses. I have notice from time to time that wearing contacts for a
long period of time makes me a bit more farsighted, but usually not
much.

One night a few months ago I took out my contacts and felt *very*
farsighted--like my glasses did little to help it, except when looking
through the reading part and even then it was not enough power. Next
morning, the same thing. I wore my glasses throughout the day,
struggling to see, and made a last-minute appointment with the doc to
get it checked. My Rx had jumped to +3.75 in both eyes, with about the
same amout of cyl. I told her the story, and she told me to come back
tomorrow, which I did, and got the same Rx again.

I had the glasses made, and at first they worked fine, but after a
period of several weeks my eyes returned to the previous Rx of +1 or
so. I checked my blood sugar, which was fine; otherwise my health is
great for a 45 year old. Can anyone explain this? Could I have gotten
the wrong base curve on my contacts and remolded my cornea? Maybe a lot
of latent hyperopia which appeared for no reason? I have no clue
Neil Brooks - 02 May 2006 21:47 GMT
> I had something happen to me a few months ago that I am completely
> unable to understand. I'm mildly farsighted (about +1 in both eyes,
[quoted text clipped - 18 lines]
> the wrong base curve on my contacts and remolded my cornea? Maybe a lot
> of latent hyperopia which appeared for no reason? I have no clue

I don't know my rear end from second base, but ... I feel a presbyope
coming on.

Like ... maybe you were always a +3.75, but -- as a younger man -- your
accommodative mechanism happily bridged the gap for you.

But now -- now that you are an OLDER man (I turned 42 today, so I can
tease) -- it's not quite so easy, so your accommodation is sort of
going out the window, leaving you with a clear look at your "full
refractive error."

Should that sort of thing happen *suddenly?*  No.  Not to MY limited
knowledge, but ... that doesn't mean that presbyopia isn't what you're
experiencing.  It may be that it hasn't really been sudden, but that
you sort of just got to your limit.  Were you experiencing any problems
going from far to near vision recently?  Any other visual symptoms??

Doc's?
norman_conway@yahoo.com - 02 May 2006 22:20 GMT
I've been a presbyope since my mid thirties, and have stabilized with
an add of +2 for the past several years. In any case, this does not
explain why it happened suddenly, then slowly returned to my usual
prescription. I have no other vision symptoms, and  my health is
otherwise fine.
Dr. Leukoma - 02 May 2006 22:35 GMT
> I've been a presbyope since my mid thirties, and have stabilized with
> an add of +2 for the past several years. In any case, this does not
> explain why it happened suddenly, then slowly returned to my usual
> prescription. I have no other vision symptoms, and  my health is
> otherwise fine.

There are no presbyopes in their mid-thirties.  You appear to be a
hyperope with accommodative spasm.  One way to tell would be to have a
cycloplegic refraction.  If that is close to +3.50, then there you have
it.

DrG
norman_conway@yahoo.com - 02 May 2006 22:53 GMT
> > I've been a presbyope since my mid thirties, and have stabilized with
> > an add of +2 for the past several years. In any case, this does not
[quoted text clipped - 8 lines]
>
> DrG

I've had multiple cycloplegic refractions, and aside from this one I've
never had a script anywhere near +3.50. I may gain 0.50D or so when
cyclopleged, but not 2-3D.
CatmanX - 02 May 2006 23:25 GMT
I concur with Greg, I would be leaning towards a temporary loss of
ciliary tone as the cause of increased plus.  An OK shift of 2.75D is
highly unlikely (although I won't say impossible).

dr grant
Neil Brooks - 03 May 2006 01:15 GMT
> I concur with Greg, I would be leaning towards a temporary loss of
> ciliary tone as the cause of increased plus.  An OK shift of 2.75D is
> highly unlikely (although I won't say impossible).
>
> dr grant

Maybe I *am* back in the game here....

If you have an accommodative spasm, then it is quite possible (was all
too true for me) that your 'garden variety' cycloplegic -- say
Tropicamide -- will NOT elicit ALL of your hyperopia.

In my (extreme) case, it took six months of nightly use of cycloplegia
and then ... bam ... one morning, I awoke with about 2.50 diopters of
additional farsightedness.

[again: Docs??] Might be worth hitting you with Cyclogyl??
LarryDoc - 03 May 2006 04:45 GMT
> If you have an accommodative spasm, then it is quite possible (was all
> too true for me) that your 'garden variety' cycloplegic -- say
> Tropicamide -- will NOT elicit ALL of your hyperopia.

FYI, tropicamide is considered to be a mydriatic (causes pupilary
dilation), not a true cycloplegic. It's cyclo effect is secondary,
highly variable and generally of little consequence.

LB, O.D.
Neil Brooks - 03 May 2006 19:34 GMT
>> If you have an accommodative spasm, then it is quite possible (was all
>> too true for me) that your 'garden variety' cycloplegic -- say
[quoted text clipped - 3 lines]
>dilation), not a true cycloplegic. It's cyclo effect is secondary,
>highly variable and generally of little consequence.

Thanks, Dr. B, for the additional info.
Dr. Leukoma - 03 May 2006 03:06 GMT
I repeat: a 35 year/old who needs a bifocal is not a presbyope, but a
latent hyperope.  I'm not ruling out the influence of a contact lens.
Even a soft lens can change the shape of the cornea.  However, this
would happen each and every time you wore the contact lens.

I am still of the opinion that you have more latent hyperopia.  As
someone suggested, you may need a stronger cycloplegic.  I am willing
to take bets that over the next 10 years, your manifest prescription
will shift increasingly towards more plus.

DrG
Dom - 03 May 2006 11:21 GMT
Were the contacts Focus Night&Day or Purevision? If so, you may have
been wearing them inside-out without realising, and given yourself
unintentional ortho-K. It happened to a patient of mine, who recovered
fully a few weeks after discontinuing lens wear. There are other case
reports out there - it's a known phenomenon.

Just one idea.

Dom

> I had something happen to me a few months ago that I am completely
> unable to understand. I'm mildly farsighted (about +1 in both eyes,
[quoted text clipped - 18 lines]
> the wrong base curve on my contacts and remolded my cornea? Maybe a lot
> of latent hyperopia which appeared for no reason? I have no clue
Dr. Leukoma - 03 May 2006 12:12 GMT
IMHO, I don't understand how a person could wear a Purevison inside out
and not know it, and in both eyes at the same time, but I guess it
could happen.

In "what will they think of next" department, would you believe that a
group of OD's has already "patented" the use of soft lenses for
orthokeratology?

DrG
norman_conway@yahoo.com - 03 May 2006 14:59 GMT
> IMHO, I don't understand how a person could wear a Purevison inside out
> and not know it, and in both eyes at the same time, but I guess it
[quoted text clipped - 5 lines]
>
> DrG

It is very easy to tell when my CLs are inside out, and I am sure this
was not the case.

I have thought a bit more about this being latent hyperopia, and it
might be. I have had problems w/ eyestrain since I was a kid, and
reading has never been easy. Also, I have noticed for many years now
that my vision has a myopic shift during the day--perhaps up to 1D at
times, though I can't be sure--which makes getting a refraction
difficult. If I am refracted in the morning, my glasses seem
over-plussed by the evening, and vice versa.

I guess the one thing that puzzles me, though, is that I never get used
to wearing higher plus glasses. My understanding is that, over time,
accomdative spasm should be relieved with higher plus glasses. And
since my glasses range from +.075 to +3.75, I am wondering why the
higher Rx does not eventually become acceptable.

So what type of cycloplegic might work if this is a case of latent
hyperopia? Is this something I can use that, over time, might stabilize
my Rx (albeit at a higher level than I would like) and potentially
relieve eyestrain? I'm an  MD so I  could get hold of it and  give it a
trial and see what happens.

Thnaks for all the thought and suggestions on this!!
Mike Tyner - 03 May 2006 15:17 GMT
> I guess the one thing that puzzles me, though, is that I never get used
> to wearing higher plus glasses. My understanding is that, over time,
> accomdative spasm should be relieved with higher plus glasses.

It makes intuitive sense that accommodative spasm _should_ decrease, but
most eye doctors can remember patients who couldn't accept full plus.

Accommodation and convergence are locked together and spasm of accommodation
affects convergence too.

Most likely the "failure to accept" means that relieving accommodation makes
the eyes struggle to stabilize at a new convergence posture. Usually it
works, but sometimes it doesn't.

-MT
Neil Brooks - 03 May 2006 21:56 GMT
>So what type of cycloplegic might work if this is a case of latent
>hyperopia? Is this something I can use that, over time, might stabilize
[quoted text clipped - 3 lines]
>
>Thnaks for all the thought and suggestions on this!!

Hi.  Ol' Johnny One-Note here again:

I think you could get pretty thorough cycloplegia with either a couple
of drops of Cyclogyl -- maybe 15 minutes apart, or with Homatropine
(maybe a touch less effective), or -- if you want to remove all doubt,
and can live with 10d - 2wks of symptoms -- four days of Atropine.

The last is the gold standard of "total cycloplegia."

If what you have is accommodative spasm, or accommodative infacility,
or ciliary spasm, or--more generally--accommodative dysfunction, then
you will likely want to have the doctor push the most plus power on
you that you can accept, both in a distance Rx and in a near Rx
(whether using bifocals or separate reading glasses), watching your
eye alignment carefully to check for any esodeviation that might need
to be managed through adjustments to the powers or through addition of
prism.

In some cases, you've developed enough "hypertonicity" in your ciliary
muscles that it's difficult for you to accept much additional plus. In
MY experience, I used cycloplegic drops every night (lower-strength;
effects gone by morning) for months, eventually "breaking the cycle."

But ... NOTE WELL: virtually all cycloplegic drops use a preservative
called Benzalkonium Chloride that has known cytotoxic effects to
corneas.  They should not be used long-term, *especially* if you have
any pre-existing ocular surface issues OR dry eyes.

It *IS* possible to get your "cramped," or "spasmed" eyes to learn to
"relax," with time.  

Another thing that I do is what's called "periocular warming" to help
relieve small amounts of accommodative spasm.  

Make/buy yourself a corn/rice bag ... like so:

http://www.quilt.com/MiscQuilting/RiceBags.html

Warm it in the microwave (I use about 2min on high) until it's warm
(NOT hot).  Place it over your closed eyes for about 10 minutes a
couple times a day.

It works.  No voodoo.  Actual science.  Here:

http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=1
5885788&dopt=Abstract


OR http://tinyurl.com/obpyd

Best of luck!

Neil
acemanvx@yahoo.com - 04 May 2006 04:10 GMT
Very interesting story. If he in fact has pseudomyopia or latent
hyperopia and relieves it, wont he see worse with latent hyperopia? He
will need a higher plus glasses and see worse without glasses. I have
pseudomyopia, probably about 1.5 diopters left of it. Natural vision
improvement helped relax some of my pseudomyopia.
norman_conway@yahoo.com - 04 May 2006 22:13 GMT
> Very interesting story. If he in fact has pseudomyopia or latent
> hyperopia and relieves it, wont he see worse with latent hyperopia? He
> will need a higher plus glasses and see worse without glasses. I have
> pseudomyopia, probably about 1.5 diopters left of it. Natural vision
> improvement helped relax some of my pseudomyopia.

Well, given that it has always been hard for me to do close work for
any length of time, I would be happy w/ stronger glasses if I could see
comfortably.
acemanvx@yahoo.com - 07 May 2006 05:54 GMT
bifocals may be your answer
 
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