new glasses adjustment period

Hi,

I recently got new glasses (basically new frames, but same
prescription) after wearing my old ones for 3 years. Anyway, I know
there's always an adjustment period, but I've never experienced like
this one before (or maybe its been a while so I don't remember). The
experience I"m getting is that the ground look closer than they
normally appear, but the biggest nuisance is that objects that ought
to be square look like "trapezoids" (the sides are slanted inward).
This is annoying since I work on the computer a lot and my flat screen
looks like a trapezoid (not pronounced trapezoid, but I can tell the
difference) and the sides of the document are slanted inward. Does
anyone know if this is normal? I called my optometrist and they
suggested to wait a couple of days for my eyes to adjust and if it
still happens again to come visit them. But I'm not sure if I'm just
being paranoid or being overly concerned. Has anyone experienced
this? Thanks.

Avalon

On or about Wed, 31 Oct 2007 18:26:31 -0000 did Avalon1178
<(E-Mail Removed)> dribble thusly:

>Hi,
>
>I recently got new glasses (basically new frames, but same
>prescription) after wearing my old ones for 3 years. Anyway, I know
>there's always an adjustment period, but I've never experienced like
>this one before (or maybe its been a while so I don't remember). The
>experience I"m getting is that the ground look closer than they
>normally appear, but the biggest nuisance is that objects that ought
>to be square look like "trapezoids" (the sides are slanted inward).
>This is annoying since I work on the computer a lot and my flat screen
>looks like a trapezoid (not pronounced trapezoid, but I can tell the
>difference) and the sides of the document are slanted inward. Does
>anyone know if this is normal? I called my optometrist and they
>suggested to wait a couple of days for my eyes to adjust and if it
>still happens again to come visit them. But I'm not sure if I'm just
>being paranoid or being overly concerned. Has anyone experienced
>this? Thanks.

There are a number of distortions introduced by glasses. What you
describe as a trapezoid sounds actually like pincushion distortion
(the reverse is barrel distortion). Another effect is minification,
where objects look smaller than they actually are.

When your prescription changes, the nature of these distortions
change, and it takes getting used to.

Without knowing the old and new prescriptions, however, one can only
speculate precisely what differences you should expect.
--
- Mike

Ignore the Python in me to send e-mail.

Dear Avalon,

Do you have your prescription?

Why not post it?

Best,

Otis


On Oct 31, 1:26 pm, Avalon1178 <Avalon1...@gmail.com> wrote:
> Hi,
>
> I recently got new glasses (basically new frames, but same
> prescription) after wearing my old ones for 3 years. Anyway, I know
> there's always an adjustment period, but I've never experienced like
> this one before (or maybe its been a while so I don't remember). The
> experience I"m getting is that the ground look closer than they
> normally appear, but the biggest nuisance is that objects that ought
> to be square look like "trapezoids" (the sides are slanted inward).
> This is annoying since I work on the computer a lot and my flat screen
> looks like a trapezoid (not pronounced trapezoid, but I can tell the
> difference) and the sides of the document are slanted inward. Does
> anyone know if this is normal? I called my optometrist and they
> suggested to wait a couple of days for my eyes to adjust and if it
> still happens again to come visit them. But I'm not sure if I'm just
> being paranoid or being overly concerned. Has anyone experienced
> this? Thanks.
>
> Avalon

My prescription hasn't changed (-1.25 on both eyes).

I don't wear glasses often and I switch between contacts and glasses.

My old glasses (again at -1.25 prescription on both eyes) are 3 years
old. The shape of the frame is somewhat rectangular but the corners
are curved so its not like a perfect rectangle

My new glasses is more rectangular, and although the corners are still
curved, it is a sharp curve so it does look more squarish than my old
glasses. I'm thinking the trapezoid effect is due to the frames
because the top part of the glasses is wider than that of the bottom,
but regardless, that shouldn't have a profound effect of making all
squares look like trapezoid, doesn't it? I dunno. If I can find the
model number of my new frames, I'll post it here, but the type is
JhaneBarnes. The lenses are antireflective, polycarbonate, and
photochromic.

The profound trapezoid effects is very obvious if I look at squarish
objects real close (like my monitor), but if I look at, say, the door
from the distance, it looks fine. Also, the ground looks much closer
to me than if I wear my old glasses (basically I feel shorter).

I hope these information helps. I'm trying to see if my eyes will
adjust, but since I work on computer a lot, the trapezoid effect gets
really annoying (basically my monitor looks wider from the top and
narrow at the bottom)

Avalon


On Oct 31, 1:14 pm, "otisbr...@pa.net" <otisbr...@pa.net> wrote:
> Dear Avalon,
>
> Do you have your prescription?
>
> Why not post it?
>
> Best,
>
> Otis
>
> On Oct 31, 1:26 pm, Avalon1178 <Avalon1...@gmail.com> wrote:
>
>
>
> > Hi,
>
> > I recently got new glasses (basically new frames, but same
> > prescription) after wearing my old ones for 3 years. Anyway, I know
> > there's always an adjustment period, but I've never experienced like
> > this one before (or maybe its been a while so I don't remember). The
> > experience I"m getting is that the ground look closer than they
> > normally appear, but the biggest nuisance is that objects that ought
> > to be square look like "trapezoids" (the sides are slanted inward).
> > This is annoying since I work on the computer a lot and my flat screen
> > looks like a trapezoid (not pronounced trapezoid, but I can tell the
> > difference) and the sides of the document are slanted inward. Does
> > anyone know if this is normal? I called my optometrist and they
> > suggested to wait a couple of days for my eyes to adjust and if it
> > still happens again to come visit them. But I'm not sure if I'm just
> > being paranoid or being overly concerned. Has anyone experienced
> > this? Thanks.
>
> > Avalon- Hide quoted text -
>
> - Show quoted text -

"Avalon1178" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed) ups.com...
> My prescription hasn't changed (-1.25 on both eyes).
>
> I don't wear glasses often and I switch between contacts and glasses.
>
> My old glasses (again at -1.25 prescription on both eyes) are 3 years
> old. The shape of the frame is somewhat rectangular but the corners
> are curved so its not like a perfect rectangle
>
> My new glasses is more rectangular, and although the corners are still
> curved, it is a sharp curve so it does look more squarish than my old
> glasses. I'm thinking the trapezoid effect is due to the frames
> because the top part of the glasses is wider than that of the bottom,
> but regardless, that shouldn't have a profound effect of making all
> squares look like trapezoid, doesn't it? I dunno. If I can find the
> model number of my new frames, I'll post it here, but the type is
> JhaneBarnes. The lenses are antireflective, polycarbonate, and
> photochromic.
>
> The profound trapezoid effects is very obvious if I look at squarish
> objects real close (like my monitor), but if I look at, say, the door
> from the distance, it looks fine. Also, the ground looks much closer
> to me than if I wear my old glasses (basically I feel shorter).
>
> I hope these information helps. I'm trying to see if my eyes will
> adjust, but since I work on computer a lot, the trapezoid effect gets
> really annoying (basically my monitor looks wider from the top and
> narrow at the bottom)
>
> Avalon

Even before your second post above, I was about to say that you have
probably been f***ed by polycarb, the worst optical material that is
commonly dispensed.

You know what, I was thinking about it too, but I always thought that
as an upgrade from my previous lenses. But I have to say that that is
one main difference between my old and new. Does polycarbonate really
add that effect in the lenses? (the trapezoidal effect and the ground
looking closer?) I was told its better because it makes the lenses
lighter and that is one reason I chose it because my previous lenses
are heavy in a sense that it adds pressure to my sinus. But I
dunno.....

What do you guys suggest?

Alright so I take it its not the polycarbonate effect then (based on
Mike Tyner's input) and from the sound of it its not the effect of the
adjustment period. Should I just go ahead and have it looked at
instead of waiting for a day or two to keep my
eyes...well...adjusting? Its probably not caused by the frame or the
prescription then but its most likely how they shaped the actual lens
themselves?

On Oct 31, 7:41 pm, Avalon1178 <Avalon1...@gmail.com> wrote:
> Alright so I take it its not the polycarbonate effect then (based on
> Mike Tyner's input) and from the sound of it its not the effect of the
> adjustment period. Should I just go ahead and have it looked at
> instead of waiting for a day or two to keep my
> eyes...well...adjusting? Its probably not caused by the frame or the
> prescription then but its most likely how they shaped the actual lens
> themselves?

if your prescription is -1.25 sphere in both eyes, its hard to
conceive of a change in material to polycarb causing the kind of
distortion you are describing. if your prescription is unchanged,
then most likely the optical centers of your new glasses are
improperly aligned with your pupils, or the base curve of one or both
of the new lenses has changed over what you are used to, or the
prescription used to make the glasses is simply wrong. all of these
possibilities are simply checked by visiting your eye doc's office, or
your optician's shop if they are not the same, and having those
possibilities checked out. simply bring in your pair of "good"
glasses versus the new "bad" glasses and have these parameters checked
out.

"Avalon1178" <(E-Mail Removed)> wrote in message
news:(E-Mail Removed) oups.com...
> You know what, I was thinking about it too, but I always thought that
> as an upgrade from my previous lenses. But I have to say that that is
> one main difference between my old and new. Does polycarbonate really
> add that effect in the lenses? (the trapezoidal effect and the ground
> looking closer?) I was told its better because it makes the lenses
> lighter and that is one reason I chose it because my previous lenses
> are heavy in a sense that it adds pressure to my sinus. But I
> dunno.....
>
> What do you guys suggest?

A lot of people claim that polycarb is not a problem, especially at low
powers. But if the lens is aspheric and polycarb, I think they are wrong.

Polycarb is lighter than regular 1.50 plastic, but so are a lot of other
materials. If you can find a transitions lens that at least 1.53 index and
not polycarb, then I would go for it.

Specifically, I would recommend the following:

HOYA Phoenix (Trivex) Transitions V (1.53 index) Spherical, and about the
same as polycarb in terms of tensile strength and impact resistance.. Trivex
is an excellent lightweight material. Transitions V is the latest version of
Transitions. This is probably the best choice for you.

Essilor SFSV Spherical Thin&Lite Transitions (1.6 index) Good choice if you
want spherical. Thin and light because of higher index, but not quite as
strong as Trivex or polycarb if safety lenses are required.

SOLA ASL Spectralite Velocity (1.54 index and aspheric). Good lightweight
material. This is probably a little cheaper than the above but is aspheric.

With your mild Rx , you don't need an aspheric lens, and you might find that
distortions are less with a spherical lens.

Thanks for all the reply and help, but this morning I went back to my
optometrist and here's the diagnosis:

- even though my prescription hasn't changed (-1.25), there is a
change in my eye such that my eye (I dont remember if one of the eyes
or both eyes) has gotten more astigmatism (my eyes hasn't always been
a perfect sphere to begin with, but I guess this time its gotten
more...well...flatter I guess), and some number called the axis
changed from 0 degress to 20 degrees.

- doc says the change was significant enough to see that noticeable
change. Note that the last time I had my lenses changed was 3 years
ago

- recommendation is to wait a week to see if the trapezoidal effect
will correct itself such that by the end of the week everything would
look normal again (my screen can finally look straight). Its ok to
switch with my old glasses if I get really annoyed (like every couple
hours or so) until my eyes adjust.

- if by the end of the week, the world is still a trapezoid, then they
can check the refraction on my eyes again to verify the numbers are
correct and readjust the lenses.

So I guess what this means is for at least a week I have to get used
to my screen looking like a trapezoid and hope that it'll correct
itself within a week.

Wish me luck!