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Dr. Leukoma
medicine forum Guru
Joined: 30 Apr 2005
Posts: 1283
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 Posted: Fri Jun 23, 2006 2:11 pm Post subject:
Re: Help: 3 Optometrists + 1 eye specialist = 4 different prescriptions!
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Given all the information, -1.75 seems way too much power. I doubt you
would be comfortable driving w/o correction if indeed that was your
true prescription. Because of this, your eyes have a tendency to
"prefer" more minus. Going from -1.75 to plano would seem rather
extreme, and you would probably "reject" that prescription. The other
prescriptions do not seem "significantly different" from each other.
There is built-in error in every measurement, and the process of
refraction is designed to truncate the error in favor of more plus
rather than too much minus.
Take it from there.
DrG
privacy_101@hotmail.com wrote:
| Quote: |
Calculate the average?
DrG
Hi Dr G,
well, re: power , the average of
0.00
0.25
0.50
and
0.75,
= 0.25, OR 0.50
Should I go for the lower one?
Also, I gave Optometrist A my prescription sunglasses, so he knew what
my previous prescription was, as did the Eye Specialist (Prescription
C). Prescriptions B and D were done with no mention of my previous
prescription. Could this have been a factor? How relevant is my past
prescription in determining my prescription today?
Andy |
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Dick Adams
medicine forum Guru
Joined: 12 Oct 2005
Posts: 300
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| Posted: Fri Jun 23, 2006 4:50 pm Post subject:
Re: Help: 3 Optometrists + 1 eye specialist = 4 different prescriptions!
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"Dr. Leukoma" <drg@leukoma.com> wrote in message news:1151071885.673686.61680@c74g2000cwc.googlegroups.com...
| Quote: | There is built-in error in every measurement, and the process of
refraction is designed to truncate the error in favor of more plus
rather than too much minus.
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That is consistent with my experience. Myopes will usually find themselves
undercorrected, an progressively so, if they happen to be progressive myopes.
That is why it is good to have a -0.25D and a -0.50D test lens. Sit with
those, in your car on a city street, and hold them before each lens in your
new eyeglasses. You will find the best (-) addition for reading signs and
seeing the fluorescent displays the most sharply. With those two lenses,
you can achieve up to -0.75D addition.
Refining the cylinder axes and power is a bit more complicated, but it can
be done indoors. I would comment further if there seemed to be interest.
You might then go back to the place where you got your glasses and ask
to have your lenses changed. But if they give you any s**t, as they most
likely will, you can just figure out what your prescription should have been,
and order some Zennis. That could be much cheaper if you are asked to pay
for your new "glass".
I should add that you may prefer to be a bit undercorrected if you are getting
presbyopic and don't feel quite ready for bifocals or fancier.
--
Dicky
(legitimate nonprofessional) |
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Dick Adams
medicine forum Guru
Joined: 12 Oct 2005
Posts: 300
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| Posted: Fri Jun 23, 2006 4:55 pm Post subject:
Ooops -- Re: Help: 3 Optometrists + 1 eye specialist = 4 different prescriptions!
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"Dick Adams" <bad.addr@nonexist.com> wrote in message news:TZUmg.14$TC1.11@trndny08...
| Quote: | ... That is why it is good to have a -0.25D and a -0.50D test lens. Sit with
those, in your car on a city street, and hold them before each lens in your |
new eyeglasses. ... <
Please insert "at night" as follows:
.... That is why it is good to have a -0.25D and a -0.50D test lens. Sit with
those, in your car on a city street, AT NIGHT, and hold them before each
lens in your new eyeglasses. ... |
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privacy_101@hotmail.com
medicine forum beginner
Joined: 22 Jun 2006
Posts: 6
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| Posted: Sat Jun 24, 2006 1:48 am Post subject:
Re: Help: 3 Optometrists + 1 eye specialist = 4 different prescriptions!
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Dr. Leukoma wrote:
| Quote: | Given all the information, -1.75 seems way too much power.
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This is a prescription i got mabye 10 years ago, I'm now 41.
I doubt you
| Quote: | would be comfortable driving w/o correction if indeed that was your
true prescription.
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well, all the Optometrists have given me a much lower 'power figure'
(?), and Im told this is something to do with ageing. Also there was no
astigmatism before.
Because of this, your eyes have a tendency to
| Quote: | "prefer" more minus. Going from -1.75 to plano
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I dont know that 'plano' means.
would seem rather
| Quote: | extreme, and you would probably "reject" that prescription. The other
prescriptions do not seem "significantly different" from each other.
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Yes, and what im after is someones opinion as to whether i should go
0.25, or 0.50. Also whether prescription B is the best / average. I've
been put in a position where I have to make a decision about what
Prescription to go for, whilst know close to nothing about Optometry.
| Quote: | There is built-in error in every measurement, and the process of
refraction is designed to truncate the error in favor of more plus
rather than too much minus.
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I'm not sure what you mean by this.. A power of -0.25 has 'more plus'
than -0.50; um, therefore is 0.25 the 'built in error in favour of more
plus? Therefore I should go for 0.50?
| Quote: |
Take it from there.
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Thanks, I'm trying to 'take this' somewhere, but I'm still confused. I
was hoping some guru would just tell me whether to go for prescription
A B C, or D. :)
B and D are the average Prescriptions, the only difference is the -0.25
or -0.50 power.
They are also the prescriptions where the Optometrist didnt know that i
used to wear -1.75..
Andy
ps, I thought Optometry would be less subjective.. During many of the
eye tests, I couldnt tell the difference, especially the astigmatism
tests (a bunch of dots on a hexagram (?)), I usually had to decide
whether I 'preferred' the bolder fuzzier dots, to the lighter/fainter
sharper ones. In hindsight, it was only in the last test that i was
also concentrating on the shape of the hexagram, and using that as a
factor as to which one I 'preferred'. when things are equally but
*different;y* distorted, its hard to select which one is 'better',
unless the patient is told what criteria to use for 'better'. At least
with the eye charts, you can either read the correct letter, or not.
The Optometrist D, when i later showed her the previous results and
asked her if 0.25 would be ok for power simply said that I read more
letters with 0.50. Does this settle the matter, or does it say more
about my subjective performance on the day.. im so confused.. |
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Dr. Leukoma
medicine forum Guru
Joined: 30 Apr 2005
Posts: 1283
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| Posted: Sat Jun 24, 2006 12:58 pm Post subject:
Re: Help: 3 Optometrists + 1 eye specialist = 4 different prescriptions!
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privacy_101@hotmail.com wrote:
| Quote: | well, all the Optometrists have given me a much lower 'power figure'
(?), and Im told this is something to do with ageing. Also there was no
astigmatism before.
|
They're not all the same now are they? Of course not.
The astigmatism probably comes from habitually over-accommodating to
the 10 year-old prescription. SHAME ON YOU. You're not a very
compliant patient, are you?
| Quote: |
I dont know that 'plano' means.
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Plano comes from plane surface which means no power = 0.
| Quote: |
Yes, and what im after is someones opinion as to whether i should go
0.25, or 0.50. Also whether prescription B is the best / average. I've
been put in a position where I have to make a decision about what
Prescription to go for, whilst know close to nothing about Optometry.
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You put yourself in the position of having to decide among several
different prescriptions. Maybe you should try all of them.
| Quote: |
I'm not sure what you mean by this.. A power of -0.25 has 'more plus'
than -0.50; um, therefore is 0.25 the 'built in error in favour of more
plus? Therefore I should go for 0.50?
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I guess the term "error" was an unfortunate term. Let's use the term
"variability." Try weighing a ball bearing on an analytical balance 5
times. You will get a different weight each time.
You are literally fretting over 0.25 diopter differences, when the fact
of the matter is that you have been wearing a ten year-old prescription
that is off by a factor of 7!
DrG |
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Dick Adams
medicine forum Guru
Joined: 12 Oct 2005
Posts: 300
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| Posted: Sat Jun 24, 2006 1:41 pm Post subject:
Re: Help: 3 Optometrists + 1 eye specialist = 4 different prescriptions!
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"Dr. Leukoma" <drg@leukoma.com> wrote in message news:1151153915.808802.178700@u72g2000cwu.googlegroups.com...
| Quote: | ... astigmatism probably comes from habitually over-accommodating to
the 10 year-old prescription.
|
Excessive accomodation does not cause myopia, but it can lead to astigmatism.
Live and learn!
| Quote: | SHAME ON YOU. You're not a very compliant patient, are you?
|
(These Dr.s do have their weapons!)
--
Dicky |
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Dr. Leukoma
medicine forum Guru
Joined: 30 Apr 2005
Posts: 1283
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| Posted: Sat Jun 24, 2006 2:41 pm Post subject:
Re: Help: 3 Optometrists + 1 eye specialist = 4 different prescriptions!
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Dick Adams wrote:
| Quote: |
Excessive accomodation does not cause myopia, but it can lead to astigmatism.
Live and learn!
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Indeed it can. In fact, people with convergence insufficiency use
their accommodation all the time to help them converge. This
inevitably leads to against-the-rule astigmatism, with/or without a
small amount of accommodative myopia.
We can teach, but it's up to you to learn.
DrG |
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Odis S. Brown
medicine forum beginner
Joined: 17 Apr 2006
Posts: 32
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| Posted: Sat Jun 24, 2006 3:02 pm Post subject:
Re: Help: 3 Optometrists + 1 eye specialist = 4 different prescriptions!
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Dear DrG-
Subject: Isley Brothers
Yes, indeed, it would be very difficult
to beat "Who's That Lady" for PURE funk
at the threshhold.
O'Kelly Isley first propounded the theory
that singing in falsetto could prevent
progression of myopia in African-American
males.
When you look BACK on the Motown era,
how many high myopes DO YOU see?
This is a scientific, NOT MEDICAL method
of evaluating the fundamental harmonics
of a damned good music group who ONCE
had Jimi Hendrix as their lead guitar player.
Best,
Odis
Rock Legend in his Own Mind |
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Dick Adams
medicine forum Guru
Joined: 12 Oct 2005
Posts: 300
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| Posted: Sat Jun 24, 2006 3:38 pm Post subject:
Re: Help: 3 Optometrists + 1 eye specialist = 4 different prescriptions!
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"Dr. Leukoma" <drg@leukoma.com> wrote in message news:1151160080.142467.43980@u72g2000cwu.googlegroups.com...
| Quote: | Excessive accommodation does not cause myopia, but it can
lead to astigmatism (?).
Indeed it can. In fact, people with convergence insufficiency use
their accommodation all the time to help them converge. This
inevitably leads to against-the-rule astigmatism, with/or without a
small amount of accommodative myopia.
|
Frankly, that makes no sense at all to me. But I don't know about
the "rule", as in "against-the-rule". There is always some new thing
up your sleeve. New facts like rabbits out of the hat.
| Quote: | We can teach, but it's up to you to learn.
|
All I ever really wanted from you guys was a pair of eyeglasses with which
I could read the blackboard, and read highway signs at night before
I overshot. Those frustrations are, indeed, related to a learning problem,
and the possible appearance of being lost.
You definitely can dazzle with your words, and these days with all
of the high-tech gizmos in your workplaces, and high-tech trade names
at you fingertips.
--
Dicky |
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Dr. Leukoma
medicine forum Guru
Joined: 30 Apr 2005
Posts: 1283
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| Posted: Sat Jun 24, 2006 4:08 pm Post subject:
Re: Help: 3 Optometrists + 1 eye specialist = 4 different prescriptions!
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Dick Adams wrote:
| Quote: |
Frankly, that makes no sense at all to me. But I don't know about
the "rule", as in "against-the-rule". There is always some new thing
up your sleeve. New facts like rabbits out of the hat.
|
Like I didn't see that remark coming.
| Quote: | All I ever really wanted from you guys was a pair of eyeglasses with which
I could read the blackboard, and read highway signs at night before
I overshot. Those frustrations are, indeed, related to a learning problem,
and the possible appearance of being lost.
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Poor Dick.
| Quote: | You definitely can dazzle with your words, and these days with all
of the high-tech gizmos in your workplaces, and high-tech trade names
at you fingertips.
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Eat your heart out.
DrG |
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Dr. Leukoma
medicine forum Guru
Joined: 30 Apr 2005
Posts: 1283
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| Posted: Sat Jun 24, 2006 4:45 pm Post subject:
Re: Help: 3 Optometrists + 1 eye specialist = 4 different prescriptions!
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odisbrown@pa.net wrote:
| Quote: | Dear DrG-
Subject: Isley Brothers
Yes, indeed, it would be very difficult
to beat "Who's That Lady" for PURE funk
at the threshhold.
O'Kelly Isley first propounded the theory
that singing in falsetto could prevent
progression of myopia in African-American
males.
When you look BACK on the Motown era,
how many high myopes DO YOU see?
This is a scientific, NOT MEDICAL method
of evaluating the fundamental harmonics
of a damned good music group who ONCE
had Jimi Hendrix as their lead guitar player.
Yes, the Motown Era was a remarkable time for the study of the |
Fundamental Eye in the average environment of Detroit, and the use of
harmonics, stepping and jiving to avoid myopia.
DrG |
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Odis S. Brown
medicine forum beginner
Joined: 17 Apr 2006
Posts: 32
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| Posted: Sat Jun 24, 2006 4:56 pm Post subject:
Re: Help: 3 Optometrists + 1 eye specialist = 4 different prescriptions!
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Dear DrG-
Subject: the end of an era
DrG> >Yes, the Motown Era was a remarkable time for the study of the
Fundamental Eye in the average environment of Detroit, and the use of
harmonics, stepping and jiving to avoid myopia.
Odis> There has been no music since
that time that could be deemed a "replaecment."
Odis> Therefore, it is safe to say that myopia
prevention among mid-1960's musicians
was primarily accomplished via the "rhythm
method."
For more information, I would suggest you visit:
www.smilingfacessometimes.org
Best,
Odis
White Man's Overbite Dancer Extraordinaire |
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Mike Tyner
medicine forum Guru
Joined: 24 Mar 2005
Posts: 1299
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| Posted: Sat Jun 24, 2006 8:22 pm Post subject:
Re: Help: 3 Optometrists + 1 eye specialist = 4 different prescriptions!
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"Dr. Leukoma" <drg@leukoma.com> wrote
| Quote: | Indeed it can. In fact, people with convergence insufficiency use
their accommodation all the time to help them converge. This
inevitably leads to against-the-rule astigmatism
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I didn't know that. What did I miss?
-MT |
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Dr. Leukoma
medicine forum Guru
Joined: 30 Apr 2005
Posts: 1283
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| Posted: Sat Jun 24, 2006 8:28 pm Post subject:
Re: Help: 3 Optometrists + 1 eye specialist = 4 different prescriptions!
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Mike Tyner wrote:
| Quote: | "Dr. Leukoma" <drg@leukoma.com> wrote
Indeed it can. In fact, people with convergence insufficiency use
their accommodation all the time to help them converge. This
inevitably leads to against-the-rule astigmatism
I didn't know that. What did I miss?
-MT
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Unfortunately would have struck the "inevitably" in favor of often, but
had already hit the send button.
I don't know what you are missing. Perhaps you haven't seen many.
DrG |
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Mike Tyner
medicine forum Guru
Joined: 24 Mar 2005
Posts: 1299
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| Posted: Sun Jun 25, 2006 1:46 am Post subject:
Re: Help: 3 Optometrists + 1 eye specialist = 4 different prescriptions!
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"Dick Adams" <bad.addr@nonexist.com> wrote
| Quote: | That is why it is good to have a -0.25D and a -0.50D test lens. Sit with
those, in your car on a city street, and hold them before each lens in
your
new eyeglasses. You will find the best (-) addition for reading signs and
seeing the fluorescent displays the most sharply. With those two lenses,
you can achieve up to -0.75D addition.
|
With this technique, without careful coaching, many people choose -050
or -075 more than they really need.
-MT |
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