Problem with prescription sunglasses

Hi,

I got a pair of prescription sunglasses from Costco recently. This is
the first time I am wearing any prescription glasses. And I am having a
lot of trouble right away. I am shortsighted. I was wearing -1.25
glasses. I got a new prescription for these glasses and they
recommended that I wear -1.5. Also, they said that I can keep wearing
my -1.25 regular glasses and use these -1.5 sunglasses, without any
problem. So, I got them made to -1.5. FYI I don't require any other
correction.

For the first couple of days I was wearing them for 10-15mins in sun
and they were great. They cut glare and harsh sunlight. They are gray
in color. These are polarised and claim UV protection. But, yesterday I
wore them for couple of hours in sun and my eyes hurt like hell. I was
not sure whether it was due to the sunglasses or something else. Then I
wore them today for some time, but, after an hour or so of wearing them
in sun, my eyes started hurting badly again. Once I reverted back to my
regular glasses, I was fine within minutes.

I took it back to Costco and they looked at both my glasses and told me
that it could be that the new glasses are not fitting well enough and
so, some light might be coming in around the edges. So, the person
there tried to reshape the frame a bit and hoped that it'll be fix the
problem. The other thing that he said might be the problem was that my
eyes might be struggling with the change of glass power from 1.25 to
1.5. My *guess* was that probably the sunglasses are not of good
quality, i.e., they don't block enough of sun ray and trick my pupil to
open up too much, leading to the above problem. Sort of another
hypothesis.

At least they have good return policy. He said I was welcome to return
them and get a refund if what he did does not solve my problems.

Does anyone ever had this kind of problem? Any thought as to what could
be causing problem?

Thanks,
N

> I got a pair of prescription sunglasses from Costco recently. This is
> the first time I am wearing any prescription glasses.

Small typo: this is the first time I am wearing any prescription
sunglasses. I have been wearing prescription glasses for 9 years.

"Nachiketa Sahoo" <(E-Mail Removed)> wrote in message news:(E-Mail Removed) oups.com...

> ... wore them for couple of hours in sun and my eyes hurt like hell ....

> Does anyone ever had this kind of problem? Any thought as to what could
> be causing problem?

Sometimes stylish eyeglasses, particularly sunglasses, are made according
to a "wrap-around" design. So your eyes looked slantedly through the
lenses. There could be a question of whether the optical centers of the
lenses are corrected for the tilt of the lenses.

It is surprising how frequently purveyors of eyeglasses are not aware that
eyeglasses perform best when they are flat to the eyes, as opposed to
tilted to achieve the appearance of being "streamlined".

--
Dicky

Dick Adams wrote:
> "Nachiketa Sahoo" <(E-Mail Removed)> wrote in message
> news:(E-Mail Removed) oups.com...
>
>> ... wore them for couple of hours in sun and my eyes
>> hurt like hell ...
>
>> Does anyone ever had this kind of problem? Any thought
>> as to what could be causing problem?
>
> Sometimes stylish eyeglasses, particularly sunglasses,
> are made according to a "wrap-around" design. So your
> eyes looked slantedly through the lenses. There could
> be a question of whether the optical centers of the
> lenses are corrected for the tilt of the lenses.
>
> It is surprising how frequently purveyors of eyeglasses
> are not aware that eyeglasses perform best when they
> are flat to the eyes, as opposed to tilted to achieve the
> appearance of being "streamlined".

Not sure of your point here Dicky. Are you saying the
manufacturers make tilted sunglasses and don't account
for it? or that the sellers bend them and don't account for
it?

-Quick

"Quick" <quick7135-(E-Mail Removed)>
wrote in message news:OZ3lg.46151$(E-Mail Removed). net...

> Not sure of your point here Dicky. Are you saying the
> manufacturers make tilted sunglasses and don't account
> for it? or that the sellers bend them and don't account for
> it?

I dunno if they could or should be held to account. They have
to make a living, and, with population exploding the way it does,
there's many more than one sucker born each minute.

We could oppose them on the grounds of good optical design,
but the answer will obviously be that people like the swept-back
lenses and one simply does one's best to supply what people want.

Quite likely it can be shown that the incremental accommodative load
for a 1.5D myope peering though lenses toed out by 15 degrees is
substantially within the bounds of reason, with prismatic, chromatic,
astigmatic, and pincushional distortion remaining entirely unaffected,
essentially.

Notwithstanding, the OP might continue to be affected by headaches.
Well, vergence stresses could be obviated by using only one eye at a
time. He could try that.

--
Dicky

These sunglasses are almost exactly like my glasses. No wrap around
nothing. Just like a pair of glasses but gray. I am not sure why that
might cause problem.

N

Dick Adams wrote:
> "Nachiketa Sahoo" <(E-Mail Removed)> wrote in message news:(E-Mail Removed) oups.com...
>
> > ... wore them for couple of hours in sun and my eyes hurt like hell ...
>
> > Does anyone ever had this kind of problem? Any thought as to what could
> > be causing problem?
>
> Sometimes stylish eyeglasses, particularly sunglasses, are made according
> to a "wrap-around" design. So your eyes looked slantedly through the
> lenses. There could be a question of whether the optical centers of the
> lenses are corrected for the tilt of the lenses.
>
> It is surprising how frequently purveyors of eyeglasses are not aware that
> eyeglasses perform best when they are flat to the eyes, as opposed to
> tilted to achieve the appearance of being "streamlined".
>
> --
> Dicky

"Nachiketa Sahoo" <(E-Mail Removed)> wrote in message news:(E-Mail Removed) oups.com...

> These sunglasses are almost exactly like my glasses. No wrap around
> nothing. Just like a pair of glasses but gray. I am not sure why that
> might cause problem.

Then I dunno. I am only an amateur optometrist, and, though I have
several merit badges in opthamology, I am not actually medically
qualified.

Perhaps you are overcorrected by the additional -0.25D. Maybe
the centers do not fit the distance between your pupils. Maybe the
gray lets through some distress-causing UV or infra-red.

Me, I always wear a baseball cap with sunglasses. Even then, the
sun finds its way around the tinted plastic in many mysterious ways.

The sun is bad for your skin anyway. Maybe you should just stay
out of it?

--
Dicky

"Mike Tyner" <(E-Mail Removed)> wrote in message news:(E-Mail Removed) ...
>
> "Dick Adams" <(E-Mail Removed)> wrote
>
> >It is surprising how frequently purveyors of eyeglasses are not aware that
> >eyeglasses perform best when they are flat to the eyes, as opposed to
> >tilted to achieve the appearance of being "streamlined".
>
> So would flat lenses work better than curved lenses?
>
> Seems to me wraparound lenses would be better at approximating Tscherning's
> ellipse in extreme gaze.

Certainly you should know that extreme gazing is what makes people bug-eyed.

--
Dicky
> -MT
>
>
>

> The sun is bad for your skin anyway. Maybe you should just stay
> out of it?

You just don't say that to someone in pittsburgh, where, sun is so
rare.

I guess I'll keep using my normal glasses in sun and let my pupil do
the adjustment to protect my eyes from to sun.

N

Dick Adams wrote:

> Then I dunno. I am only an amateur optometrist, and,
> though I have several merit badges in opthamology, I
> am not actually medically qualified.

What does this mean? Are you a certified optometrist
and just not practicing professionally? What are "merit
badges in opthamology"?

Someone might easily construe this to mean that you
do, in fact, have some medical qualifications. Is that
the case?

-Quick