My glasses make shapes distorted
ncgu...@gmail.com
noticed I was having trouble reading things from far away so I went to
an eye doctor.
My prescption came out to be:
OD -0.75 -1.25 28
OS 0.00 -1.00 164
So I get some glasses and contacts and am reasonably happy except for
the fact that when I look at rectangular objects with the glasses on,
they were distorted. Sides look like / \ and top slants down about 5
degrees. As I work on a computer all day it is rather annoying.
So I went back and described my situation and he redid my eye test.
Adjusted things a bit and came out with this presciption:
OD -0.25 -1.25 28
OS 0.00 -1.25 166
Remade the glasses, and same thing. They tried adjusting the tilt of
the lenses for quite a while but nothing helped. Dr. finally
basically said it is just something I need to adjust to with my
astigmatism, but I don't really want to have to adjust to it and don't
know if I can since the glasses are backups. I wear the contacts much
more frequently and don't get the issue with them. Also other long
time glass wearers tried them and said they saw the same thing as me.
I returned the glasses back to Lens Crafters to try somewhere else and
different frame. Just got the latest pair in and the same thing is
happening. This time it is reduced in the left but is still stong in
the right. Things now look like this | \ and slant down on the top at
the same 5 degrees.
So two questions I was hoping to get help with.
1) Could it be the lab making the lenses? The second place I went was
Luxotica owned as well (Target Optical) but I didn't know it until
later.
2) Could it be the lens material? All three tries were polycarbonate
with AR coatings. I have researched a bit on the web and see that
some people claim poly can cause these kinds of distortions while
other say that is a myth.
Any suggestions and help would be greatly appreciated.
otis...@embarqmail.com
Dear Nc,
Sometimes "Astigmatism" is over-done.
Just for a test, you might request a "spherical equivalent" lens, and
accept that you will pass the 20/25 line.
Ask them to provide this lens to you -- and then check the shape to
see if you still get the "cyl" distortion you report.
Dan Abel
<6c6fa231-4daf-4612...@v17g2000vbb.googlegroups.com>,
ncgu...@gmail.com wrote:
> I haven't ever had glasses or contacts until a few weeks ago
> My prescption came out to be:
>
> OD -0.75 -1.25 28
> OS 0.00 -1.00 164
>
> So I get some glasses and contacts and am reasonably happy except for
> the fact that when I look at rectangular objects with the glasses on,
> they were distorted. Sides look like / \ and top slants down about 5
> degrees. As I work on a computer all day it is rather annoying.
> Dr. finally
> basically said it is just something I need to adjust to with my
> astigmatism, but I don't really want to have to adjust to it and don't
> know if I can since the glasses are backups. I wear the contacts much
> more frequently and don't get the issue with them. Also other long
> time glass wearers tried them and said they saw the same thing as me.
> Any suggestions and help would be greatly appreciated.
Don't put lenses in front of your eyes. They will distort your vision.
Actually, even if you don't put lenses in front of your eyes, your
vision will still be distorted. Find a train track. Stand in the
middle of the tracks and look down a straight section. The tracks will
converge. Above you stated "look like / \". If you walk down the
tracks, measuring the distance between the tracks, it won't change
(unless you have really funny trains). That's just how vision works.
After a week or so, your brain will probably adjust to the glasses, just
like you have learned to adjust to the train tracks without glasses.
Contacts don't add much distortion, so that is easier for the brain to
adjust to.
I somehow suspect that the glasses aren't the problem.
--
Dan Abel
Petaluma, California USA
da...@sonic.net
Mark A
news:6c6fa231-4daf-4612...@v17g2000vbb.googlegroups.com...
It is possibly the polycarbonate and/or using an aspheric lens design. You
do not need polycarb in an Rx that weak. Have them remake in a CR-39 and
make sure it is a non-aspheric lens design.
ncgu...@gmail.com
> like you have learned to adjust to the train tracks without glasses.
> Contacts don't add much distortion, so that is easier for the brain to
> adjust to.
>
> I somehow suspect that the glasses aren't the problem.
>
> --
> Dan Abel
Well, that is the thing. I doubt I will wear them enough for my brain
to adjust to. If I wear my contacts 90% of the time, I don't want the
10% of the time I do wear the glasses to keep seeing parellograms.
It just seems weird that if it isn't the glasses and it is a common
thing for new wearers, that more people wouldn't have something to say
about it. The Dr. and lab techs all said that they had heard of it,
but never had one of their patients complain about it.
Mike Tyner
<ncgu...@gmail.com> wrote
> basically said it is just something I need to adjust to with my
> astigmatism, but I don't really want to have to adjust to it and don't
> know if I can since the glasses are backups.
Your prescription causes distortion no matter who makes the lenses.
The distortion increases with increasing distance off your eye. That's why
glasses do it and contacts don't. It also increases with power, so it's
helpful to make sure they aren't overdone.
You have several options.
1) Get used to it.
2) Try to find a frame that fits the lenses closer to your eye. Your
contacts don't distort because they are directly on the eye. If you could
hold them out 10 mm like your glasses, _they'd distort just as much._
3) Have the prescription re-written with "compromised" values that surrender
some sharpness but give less distortion.
> I wear the contacts much
> more frequently and don't get the issue with them.
Contacts don't distort because they are zero distance from your eye.
Distortion is multiplied by distance.
> Also other long
> time glass wearers tried them and said they saw the same thing as me.
And if you put _their_ glasses on, you'd see distortion in _their_ lenses,
even after you got used to your own.
> I returned the glasses back to Lens Crafters to try somewhere else and
> different frame. Just got the latest pair in and the same thing is
> happening.
Because you didn't believe the doctor. Every single person wearing glasses
has distortion (unless the prescription is zero.) They all got used to it,
and you will too, once you understand it's natural and have the patience to
let your brain adjust. When it does, it won't be so hard to go back and
forth.
> This time it is reduced in the left but is still stong in
> the right. Things now look like this | \ and slant down on the top at
> the same 5 degrees.
Yada yada. I don't mean to seem callous but you must realize that the next
guy has distortion but _his_ leans the _other_ way and it's 3.34 degrees
downward in the lower left corner and on and on with details that can't tell
us anything.
In glasses, sharp=distorted, increasing with vertex distance. Closer-fitting
glasses don't distort as much. Contacts don't distort because the vertex
distance is zero. Contacts have spoiled you.
With patience, your visual cortex develops new references and shapes don't
look distorted. Or they might, but it won't bother you or feel "wrong."
> So two questions I was hoping to get help with.
> 1) Could it be the lab making the lenses? The second place I went was
> Luxotica owned as well (Target Optical) but I didn't know it until
> later.
The laws of physics are different in Italy?
> 2) Could it be the lens material? All three tries were polycarbonate
> with AR coatings. I have researched a bit on the web and see that
> some people claim poly can cause these kinds of distortions while
> other say that is a myth.
Polycarb causes color fringes in high prescriptions. Otherwise it's an
excellent material. If someone tells you otherwise, look for an agenda.
> Any suggestions and help would be greatly appreciated.
Put your contacts away for a week.
I absolutely HATE telling people "wear it and you'll get used to it." But
this is one circumstance where it's appropriate.
-MT, OD
Dan Abel
<b9b6cfac-0089-4b3f...@q14g2000vbn.googlegroups.com>,
ncgu...@gmail.com wrote:
> > After a week or so, your brain will probably adjust to the glasses, just
> > like you have learned to adjust to the train tracks without glasses. �
> > Contacts don't add much distortion, so that is easier for the brain to
> > adjust to.
> >
> > I somehow suspect that the glasses aren't the problem.
> Well, that is the thing. I doubt I will wear them enough for my brain
> to adjust to.
I wish I could say something more helpful, but everybody is different.
Nobody really knows how long it will take, but the standard advice is
"two weeks", as I remember. I had a much more severe problem with
glasses. My doctor said that many people would never adjust to this
problem. It took about three years. Of course, I had a choice. Just
don't wear them. I made the conscious decision that putting up with
double vision was better than the alternative. I wore contacts 7 days a
week, 14 hours a day, back before they had overnight wear contacts.
> If I wear my contacts 90% of the time, I don't want the
> 10% of the time I do wear the glasses to keep seeing parellograms.
I'm not a professional, but my understanding is that you will get used
to it, unless you just wear them for a few seconds a week. Mike is a
professional. He's seen this.
> It just seems weird that if it isn't the glasses and it is a common
> thing for new wearers, that more people wouldn't have something to say
> about it. The Dr. and lab techs all said that they had heard of it,
> but never had one of their patients complain about it.
Every single eye doctor, on giving out new glasses, whether for the
first time, or for a major change, tells the patients that "they will
have to get used to them". I'm not an eye doctor, but that's been my
experience.