pupil position compensation

Hello,
I've a plastic luxotica frame and I recently had
some new lenses installed at Costco.

The prescription is -2.00 -0.50 both eyes.

However, I find I'm unable to wear them for an
extended time as I start to get eye fatigue and a mild
headache after about 30 minutes.

I took a look in the mirror with them on, and I can see my puils are
not in the center of the lens. The pupils are closer together than
the lens centers - I assume this is taken care of with the PD
measurement.

But even more noticable is that my puipls are not in the middle
from top to bottom either. I would say by estimation, that my pupils
are 5 or 6 millimeters *above * the lens center. (it's quite a deep
lens shape) - IS this causing my eye fatigue and discomfort?

Thanks,

Dave

davexnet wrote:
>
> Hello,
> I've a plastic luxotica frame and I recently had
> some new lenses installed at Costco.
>
> The prescription is -2.00 -0.50 both eyes.
>
> However, I find I'm unable to wear them for an
> extended time as I start to get eye fatigue and a mild
> headache after about 30 minutes.

In the absence of professional opinions...
Is the "seeing" difficult? Do you feel you're forcing your eyes to do
what they're supposed to? I've had lenses done badly twice. They never
told me what the problem was, but they re-made the lenses and everything
was fine. I think you just got lucky!

> I took a look in the mirror with them on, and I can see my puils are
> not in the center of the lens. The pupils are closer together than
> the lens centers - I assume this is taken care of with the PD
> measurement.
>
> But even more noticable is that my puipls are not in the middle
> from top to bottom either. I would say by estimation, that my pupils
> are 5 or 6 millimeters *above * the lens center. (it's quite a deep
> lens shape) - IS this causing my eye fatigue and discomfort?

--
Cheers,
Bev
================================================== ================
"I used to be convinced that MicroSquish shipped crap because they
simply didn't give a flying **** as long as the sheep kept buying
their ****. Now, I'm convinced that they really do ship the best
products they are capable of writing, and *that's* tragic."
- John C. Randolph, about MS quality control.

davexnet <(E-Mail Removed)> wrote in
news:(E-Mail Removed):

> Hello,
> I've a plastic luxotica frame and I recently had
> some new lenses installed at Costco.
>
> The prescription is -2.00 -0.50 both eyes.
>
> However, I find I'm unable to wear them for an
> extended time as I start to get eye fatigue and a mild
> headache after about 30 minutes.
>
> I took a look in the mirror with them on, and I can see my puils are
> not in the center of the lens. The pupils are closer together than
> the lens centers - I assume this is taken care of with the PD
> measurement.
>
> But even more noticable is that my puipls are not in the middle
> from top to bottom either. I would say by estimation, that my pupils
> are 5 or 6 millimeters *above * the lens center. (it's quite a deep
> lens shape) - IS this causing my eye fatigue and discomfort?
>
> Thanks,
>
> Dave
>

Are your pupils decentered with respect to the optical centers of the
lenses, or just decentered with respect to the frame? There is a
difference. Prescribing for eyeglasses requires that your inter-pupillary
distance be measured, and this dictates where the OC's of the lenses are
placed in the frame when the lenses are "laid-out" and mounted. Vertical
decentration, because it is the same for both eyes(i.e. "yolked"), is
seldom considered, except in prescriptions far higher than -2.00. So,
while there might be some induced prism if the lenses are not properly
aligned horizontally, it is unlikely going to be enough to induce a
problem. Maybe you should go back to your optometrist and have both the
eyeglasses and prescription re-checked.

DrG

On Sun, 21 Sep 2003 13:03:15 GMT, "Dr. Leukoma"
<(E-Mail Removed)> wrote:

>davexnet <(E-Mail Removed)> wrote in
>news:(E-Mail Removed) :
<snip>
>> But even more noticable is that my puipls are not in the middle
>> from top to bottom either. I would say by estimation, that my pupils
>> are 5 or 6 millimeters *above * the lens center. (it's quite a deep
>> lens shape) - IS this causing my eye fatigue and discomfort?
>>
>> Thanks,
>>
>> Dave
>>
>
>Are your pupils decentered with respect to the optical centers of the
>lenses, or just decentered with respect to the frame? There is a
>difference.
The PD has been measured, see below.

> Prescribing for eyeglasses requires that your inter-pupillary
>distance be measured, and this dictates where the OC's of the lenses are
>placed in the frame when the lenses are "laid-out" and mounted. Vertical
>decentration, because it is the same for both eyes(i.e. "yolked"), is
>seldom considered, except in prescriptions far higher than -2.00. So,
>while there might be some induced prism if the lenses are not properly
>aligned horizontally, it is unlikely going to be enough to induce a
>problem.
I lifted the frame slightly above my nose the required amount to make
my eyes centered. It seemed better.

> Maybe you should go back to your optometrist and have both the
>eyeglasses and prescription re-checked.
>
>DrG
Thanks for the info. It's pssible the prescription and or PD
are slightly out, but it can't be by much -
enough to cause a sense of eye-fatigue? I don't know the answer to
that.
About 2 months ago (prior ot my encounter at Costco) I went to an
independent eye Dr while I was on vacation in Vancouver (I live in
Los angeles) becaue my old specs broke when I got there.
The prescription was
R -2.00 -0.50 70
L -1.75 -0.50 95

I had a pair made up at lenscrafters because I need them asap.

After about two weeks of wearing them I was having some difficulties,
being unable to wear them for more than about an hour with out
experiencing very tired eyes.

I visited the Doctor again (I was still in Vancouver) and he noted
that the frame wasn't a good fit, which he said was a factor.
While I was there he rechecked the acuity and this time came up with
R -2.00 -0.50 75
L -2.00 -0.50 90

It's slightly different; he seemed indifferent to it in the sense
that one was not necessarily more reliable than the other because
it could be due to factors such as tiredness, etc,etc.
Anyway he gave me the second prescription. In the meantime I returned
the specs to lenscafters and got a refund.

The Dr. also measured the PD which he said was 62.
Lenscrafters said the PD was 63,
and in Costco it was 60 1/2.
All measured using one of those hand-help optical devices.


I'm going to go back to Costco tomorrow.

Dave

davexnet <(E-Mail Removed)> wrote in
news:(E-Mail Removed):

> On Sun, 21 Sep 2003 13:03:15 GMT, "Dr. Leukoma"
> <(E-Mail Removed)> wrote:
>
>>davexnet <(E-Mail Removed)> wrote in
>>news:(E-Mail Removed) m:
> <snip>
>>> But even more noticable is that my puipls are not in the middle
>>> from top to bottom either. I would say by estimation, that my
>>> pupils are 5 or 6 millimeters *above * the lens center. (it's quite
>>> a deep lens shape) - IS this causing my eye fatigue and discomfort?
>>>
>>> Thanks,
>>>
>>> Dave
>>>
>>
>>Are your pupils decentered with respect to the optical centers of the
>>lenses, or just decentered with respect to the frame? There is a
>>difference.
> The PD has been measured, see below.
>
>> Prescribing for eyeglasses requires that your inter-pupillary
>>distance be measured, and this dictates where the OC's of the lenses
>>are placed in the frame when the lenses are "laid-out" and mounted.
>>Vertical decentration, because it is the same for both eyes(i.e.
>>"yolked"), is seldom considered, except in prescriptions far higher
>>than -2.00. So, while there might be some induced prism if the lenses
>>are not properly aligned horizontally, it is unlikely going to be
>>enough to induce a problem.
> I lifted the frame slightly above my nose the required amount to make
> my eyes centered. It seemed better.
>
>> Maybe you should go back to your optometrist and have both the
>>eyeglasses and prescription re-checked.
>>
>>DrG
> Thanks for the info. It's pssible the prescription and or PD
> are slightly out, but it can't be by much -
> enough to cause a sense of eye-fatigue? I don't know the answer to
> that.
> About 2 months ago (prior ot my encounter at Costco) I went to an
> independent eye Dr while I was on vacation in Vancouver (I live in
> Los angeles) becaue my old specs broke when I got there.
> The prescription was
> R -2.00 -0.50 70
> L -1.75 -0.50 95
>
> I had a pair made up at lenscrafters because I need them asap.
>
> After about two weeks of wearing them I was having some difficulties,
> being unable to wear them for more than about an hour with out
> experiencing very tired eyes.
>
> I visited the Doctor again (I was still in Vancouver) and he noted
> that the frame wasn't a good fit, which he said was a factor.
> While I was there he rechecked the acuity and this time came up with
> R -2.00 -0.50 75
> L -2.00 -0.50 90
>
> It's slightly different; he seemed indifferent to it in the sense
> that one was not necessarily more reliable than the other because
> it could be due to factors such as tiredness, etc,etc.
> Anyway he gave me the second prescription. In the meantime I returned
> the specs to lenscafters and got a refund.
>
> The Dr. also measured the PD which he said was 62.
> Lenscrafters said the PD was 63,
> and in Costco it was 60 1/2.
> All measured using one of those hand-help optical devices.
>
>
> I'm going to go back to Costco tomorrow.
>
> Dave
>
>
>


The probably gave you polycarbonate lenses in order to make them thinner.
This is the only material I know that can be this sensitive to vertical
decentration, either that or you have some induced vertical prism.

Costco? What's the world coming to?

DrG

On Mon, 22 Sep 2003 11:47:04 -0500, Robert Martellaro
<(E-Mail Removed)> wrote:

>On 22 Sep 2003 13:33:32 GMT, (E-Mail Removed) (Specs31) wrote:
>
>>>The Dr. also measured the PD which he said was 62.
>>>Lenscrafters said the PD was 63,
>>>and in Costco it was 60 1/2.
>>>All measured using one of those hand-help optical device
>
>Jeff,
>
>All PDs at Costco are 60.5mm. The horizontal optical centers could be
>anywhere.
>
>Robert
>
Gentlemen, thanks for your responses.
I went back to Costco. The guy used his machine to pinpoint
the lens centers and marked it with a pen. I put on the frame
and he looked at it, and he seemed satisfied that the dots were
over the puipls, and according to him, 60.5 seemed right.

I did lift up the frame from my nose in front of the guy so that
it was centered and sure enough, it did look better. More natural,
an less of a feeling that I was fighting against it.

He measured the difference at 6mm and sent them back to be redone.

I'll have an update in a week - ten days.

Dave

davexnet <(E-Mail Removed)> wrote in message news:<(E-Mail Removed)>. ..
> On Mon, 22 Sep 2003 11:47:04 -0500, Robert Martellaro
> <(E-Mail Removed)> wrote:
>
> >On 22 Sep 2003 13:33:32 GMT, (E-Mail Removed) (Specs31) wrote:
> >
> >>>The Dr. also measured the PD which he said was 62.
> >>>Lenscrafters said the PD was 63,
> >>>and in Costco it was 60 1/2.
> >>>All measured using one of those hand-help optical device
> >
> >Jeff,
> >
> >All PDs at Costco are 60.5mm. The horizontal optical centers could be
> >anywhere.
> >
> >Robert
> >
> Gentlemen, thanks for your responses.
> I went back to Costco. The guy used his machine to pinpoint
> the lens centers and marked it with a pen. I put on the frame
> and he looked at it, and he seemed satisfied that the dots were
> over the puipls, and according to him, 60.5 seemed right.
>
> I did lift up the frame from my nose in front of the guy so that
> it was centered and sure enough, it did look better. More natural,
> an less of a feeling that I was fighting against it.
>
> He measured the difference at 6mm and sent them back to be redone.
>
> I'll have an update in a week - ten days.
>
> Dave
I got them back and they are much more comfortable for me now,
I don't get the sense of disorientation. The dude in Costco told me
most people can tolerate that kind of vertical displacement without
problems.
thanks -
Dave