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Medical Forum / General / Vision / May 2005

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New prescription problems

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DJ Kazuya - 08 May 2005 21:27 GMT
After six years with the same contact lenses prescription (-3.75 in each
eye), my doctor changed my prescription to -4.00.  I wasn't surprised, as I
had noticed my distance vision wasn't quite as sharp as it probably should
have been.

However, since putting in the new lenses I have noticed a couple of changes.
First, my ability to see "right under my nose" seems to be worse, for
example if you were to put your face right in front of the mirror and try to
look closely at your pores.  I understand this is probably normal for
correcting for distance past a certain threshold... I guess I found my
threshold.

The other change is harder to quantify, but I guess for whatever reason my
vision just isn't quite "right".  I can see fine but something just seems
funny, and it seems most noticeable when I'm in front of the computer screen
(which I often am, for work and school).  It's like reading requires more
effort, even though I can't pinpoint anything that's wrong.  Could it be
that my eyes are just adjusting to the new prescription?  I had assumed that
with the prescription change being small, that I would have little or no
adjustment.... perhaps I was wrong.
Signature

peace Kazuya

William Stacy - 08 May 2005 21:53 GMT
Could it be that you're now over 40 years old?  That would explain it,
as presbyopia is causing it.  I'f you're under 40, something else may be
going on.  Either way, it sounds like reading glasses over your contact
may be in order.

w.stacy, o.d.

> After six years with the same contact lenses prescription (-3.75 in each
> eye), my doctor changed my prescription to -4.00.  I wasn't surprised, as I
[quoted text clipped - 16 lines]
> with the prescription change being small, that I would have little or no
> adjustment.... perhaps I was wrong.
LarryDoc - 08 May 2005 22:42 GMT
> After six years with the same contact lenses prescription (-3.75 in each
> eye), my doctor changed my prescription to -4.00.  I wasn't surprised, as I
[quoted text clipped - 7 lines]
> correcting for distance past a certain threshold... I guess I found my
> threshold.

Not exactly. But before I begin, I'm going with the assumption that your
eye care practitioner correctly determined that you needed that .25
additional power for better distance vision and in fact, you *do* have
decernably clearer distant (past 20'/6m) vision.

If you are over about 40 years old, the age-related decrease of near
point focusing power is being realized.  You were under-corrected for
total power which gave you the ability to see those pores and with
higher, presumably correct power, you get to experience presbyopia.  
That 'right under your nose" blur will soon be replaced by "my arms are
too short" or "I can't see the phone book" or the dreaded "waiter, do
have spare reading glasses or can I sit at table with more light?"

> The other change is harder to quantify, but I guess for whatever reason my
> vision just isn't quite "right".  I can see fine but something just seems
[quoted text clipped - 4 lines]
> with the prescription change being small, that I would have little or no
> adjustment.... perhaps I was wrong.

Mostly, you're right, although some people, especially new, early
presbyopes do indeed require a few days to feel comfortable with new
lenses.  Another issue to consider is whether you are using the
identical contact lenses in a .25 higher power or where you re-fit to
another lens design?  That can cause some adaptive issues. And another
possibility is that your contact lens is defective or the power is
mis-marked, in which case your practitioner can figure it out.

So there you have it.  Why not just call the doctor and check it out!  
Then, you'll know for certain and you can sit back and enjoy the OtisFun
program on this newsgroup!

Oh yeah----maybe you should try "the plus".  ;-)SBT (sarcasm, big time)
DJ Kazuya - 08 May 2005 23:56 GMT
> Not exactly. But before I begin, I'm going with the assumption that your
> eye care practitioner correctly determined that you needed that .25
> additional power for better distance vision and in fact, you *do* have
> decernably clearer distant (past 20'/6m) vision.

Yes... it is subtle but my vision is sharper at a distance.  It's certainly
not a "wow" change overall though.  Not really noticeable except for
distance.

> If you are over about 40 years old, the age-related decrease of near
> point focusing power is being realized.  You were under-corrected for
[quoted text clipped - 3 lines]
> too short" or "I can't see the phone book" or the dreaded "waiter, do
> have spare reading glasses or can I sit at table with more light?"

I'm 31, for the record.

>> The other change is harder to quantify, but I guess for whatever reason
>> my
[quoted text clipped - 15 lines]
> possibility is that your contact lens is defective or the power is
> mis-marked, in which case your practitioner can figure it out.

Using the same brand of lenses with just the higher power.  I suppose the
weirdest thing is that I can't describe what feels wrong, which also causes
me to think that maybe it's all in my head.  If it was just me adjusting to
the prescription, that would actually probably make the most sense.  I
probably will give the doctor a call on Monday.
Signature

peace Kazuya

William Stacy - 09 May 2005 00:56 GMT
> I'm 31, for the record.

Then I'm guessing something is wrong here.  If they made no change to
lens brand, base curve, diameter, and only increased it by .25, you
should not notice it as much as you are.  Go back and make sure that's
all that was changed.  If so, you have an unusual sensitivity to minute
changes.  I suppose you could have gotten a defective pair. Report back
here when you find out.

w.stacy, o.d.
LarryDoc - 09 May 2005 03:45 GMT
> I'm 31, for the record.

> Using the same brand of lenses with just the higher power.  I suppose the
> weirdest thing is that I can't describe what feels wrong, which also causes
> me to think that maybe it's all in my head.  If it was just me adjusting to
> the prescription, that would actually probably make the most sense.  I
> probably will give the doctor a call on Monday.

Then something is clearly wrong here. Don't probably call the doctor,
for certain do it.  And let us know what you discover.

--LB. O.D.
Dan Abel - 13 May 2005 23:26 GMT
> After six years with the same contact lenses prescription (-3.75 in each
> eye), my doctor changed my prescription to -4.00.  I wasn't surprised, as I
[quoted text clipped - 13 lines]
> (which I often am, for work and school).  It's like reading requires more
> effort,

You didn't say what your age was, but all these things are consistent with
presbyopia.  From what I've read, everybody gets this, usually around
middle age.  It just means that you lose the ability to focus, and comes
in gradually.  If you get glasses or contacts that give sharp vision at
distance, then you get blurry vision up close.  If you get glasses or
contacts that give sharp vision up close, then distance is blurry.

There are many "cures", but they all have disadvantages.  When I wore
glasses and got presbyopia, I had two pairs, one for close and one for
distance.  One was on my face, the other in my pocket.  I switched as
necessary.  When I got contacts, I got them for distance and bought cheap
OTC reading glasses at the drugstore.  You can try them on at the
drugstore and they usually have a little testing chart on the display to
help you find the strength that works for you.  You'll want to get the
weakest that work for the distance.  You may be able to get ones that work
both for reading and the computer, although you need a weaker strength for
the computer because people normally look from farther away.

You can get bifocal contacts, but many people find that they don't work
for them.  You could also try monovision, where one contact is set for
distance and the other up close.  Your brain will eventually learn to use
the sharp image and ignore the other blurry one.  Needless to say, this is
not good for your depth perception.

Signature

Dan Abel
Sonoma State University
AIS
dabel@sonic.net

DJ Kazuya - 14 May 2005 01:37 GMT
>> After six years with the same contact lenses prescription (-3.75 in each
>> eye), my doctor changed my prescription to -4.00.  I wasn't surprised, as
[quoted text clipped - 43 lines]
> the sharp image and ignore the other blurry one.  Needless to say, this is
> not good for your depth perception.

I tried to call the doctor when I got back from being away, but apparently
Friday is his day to fry people with the laser.  I should be able to speak
to him Monday.

I have been able to more or less clarify a little bit better what is
troubling me since the first post.  First of all, when I said I can't see
under my nose I meant literally under my nose.  I can hold a newspaper six
inches from my nose and read it fine.  My vision is fine, but the problem is
(which I wasn't able to describe accurately before, I just knew something
wasn't right) is that my eyes have had a "tired" feeling ever since I got
the new prescription.  Also, the problem is most noticeable when I'm reading
from the computer monitor.  Additionally, it has gotten better as the days
have gone on (I put in my new contacts on May 4), so it's not as bad as day
one... basically I'm mostly fine when I'm not reading the monitor (which is
probably two feet away from my eyes).

So there you have it... 6 years wearing -3.75 in each eye with no problems,
then change to -4.00 in each eye and my eyes are tired.  Seemingly, slowly
getting better.
Signature

peace Kazuya

William Stacy - 14 May 2005 14:03 GMT
> So there you have it... 6 years wearing -3.75 in each eye with no problems,
> then change to -4.00 in each eye and my eyes are tired.  Seemingly, slowly
> getting better.

I doubt it was that power change.  Too small to cause such symtoms
unless you're extremely sensitive.  I'd look for other changes in the
lenses (base curve, brand, series, etc.) and possibly unrelated causes
(systemic medical problems, new near point stresses, etc.). But one very
easy way to find out:  get another pair of the older lenses and see if
that helps.

w.stacy, o.d.
DJ Kazuya - 23 May 2005 22:59 GMT
>> So there you have it... 6 years wearing -3.75 in each eye with no
>> problems, then change to -4.00 in each eye and my eyes are tired.
[quoted text clipped - 7 lines]
>
> w.stacy, o.d.

Thought I'd update as a courtesy to those who were kind enough to offer
advice: despite my concerns that my vision seems imperceptibly off, the doc
seems to agree with some of you that it's probably not my prescription.  He
says that going by my history as a heavy computer user and the specifics of
my contact lens wearing history, my tired eyes could be the result of a bit
of dryness.  So I've been sent home with some drops, some new fluid, and a
couple of different kinds of lenses.  We'll see how this goes.
Signature

peace Kazuya

 
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