spectacle vs contacts rx

#6 03-12-2006, 04:54 PM

you friggin dumbass. you have it backwards AGAIN. if her contact
prescription is right then her glasses are too strong. hard to tell
which is right though, and the "small amount of astigmatism" confounds
things too.

the point is, you don't know enough to be posting here. you think you
do, but your fundamental lack of understanding basic optics keeps
showing through.

go somewhere else. quit showing your ass in this forum. go post in
drug forums where you have more expertise.

#5 03-11-2006, 12:39 PM

WHat do you know. Judith already states the contacts are good and the
glasses are not. Thus there would appear to be an overcorrection
problem or an aberration problem.

Stop stricking your nose in where it does not fit you little fool.

dr grant

#4 03-11-2006, 12:03 PM

If your not seeing well with glasses, maybe they are too weak? Although
with -6 contacts, you should see fine with -7.5 glasses but it depends
on the person. Try a simple test, tilt your glasses and see if this
sharpens things. If you have been an exclusive contact wearer, itll
take some time to get used to glasses because of its minification and
disortion.

#3 03-11-2006, 09:17 AM

judith wrote:
- quote -

> Thank you for your reply.
> I do know that my contacts are slightly undercorrected but than again my
> optometrist also undercorrected my left eye from -8 to -7.5. Because my
> astigmatism is small, he said that I did not need a correction for that.
> Typically, how lond should it take me to get used to my new specs? I find
> that I am avoiding wearing them as the vision is not as good as my contacts?
> Is there anyway they can take a contact prescription and change it to a
> spectacle prescription? Also, since my contact BC is 8.4 and my specs are
> high index lens, how does that affect vision?
> thanks again, your comments are appreciated

Do you know what material your new glasses are made of? Some high index
materials give poor quality vision, especially polycarbonate. The BC 8.4
in your contacts probably isn't relevant.

But whether this is a factor or not, I tend to agree with the other
reply that you may have been (unknowingly) overfocussing during the
eyetest. If you go back for a recheck, try to avoid doing it after you
have just been doing a lot of reading or other close work. Also, when
you are answering the questions about 'does this one look clearer', make
sure you are looking for clarity, rather than how 'black' or how 'nice'
the letters look.

Your contacts Rx doesn't match up with your glasses Rx so one of them
must be wrong. The difference should be around 0.50 (to 0.75) dioptres,
not 1.00 to 1.50 dioptres.

Dom

#2 03-10-2006, 06:37 PM

There are several issues to be considered. One is corneal oedema.
Wearing your lenses prior to the test can cause the cornea to swell and
give a high reading. Assuming the spec script is correct, you will find
spatial distortion due to the high spec script and the lens being 12 mm
from your corneal plane.

If the spec script is wrong, it should not be too far out as it will be
around -.50D too strong.

Go back and discuss it with your OD.

dr grant

#1 03-10-2006, 06:18 PM

Thank you for your reply.

I do know that my contacts are slightly undercorrected but than again my
optometrist also undercorrected my left eye from -8 to -7.5. Because my
astigmatism is small, he said that I did not need a correction for that.
Typically, how lond should it take me to get used to my new specs? I find
that I am avoiding wearing them as the vision is not as good as my contacts?
Is there anyway they can take a contact prescription and change it to a
spectacle prescription? Also, since my contact BC is 8.4 and my specs are
high index lens, how does that affect vision?

thanks again, your comments are appreciated
Mike Tyner wrote:
- quote -

> > Diopter -6, BC 8.4, DIA 14.0
> > I have fairly good vision with this prescription. Some problem at night
> > as I
> > have small amount of astigmatism burt overal not too bad.
> "Fairly good" usually means "less than 20/20" or "less than it could be.
> If your vision isn't excellent with contacts (especially if the left is
> worse), it's reasonable that your glasses could be "right."
> Glasses have reflections (double?) that don't occur with contacts.
> The prescription you listed for glasses has no astigmatism correction.
> It is common for young people to overcompensate during refraction, making
> the prescription come out higher than it needs to be.
> Your problems should be discussed with the prescribing doctor. I usually
> repeat the refraction, especially to make sure that one notch less
> correction is blurry.
> > Also, does it make sense to have such a DIFFERENCE between my contact and
> > spectacle prescription?
> It isn't typical to see this much difference, but we can't assume your
> contacts were "right."
> -MT

03-10-2006, 05:26 PM

"judith" <u19543[at]uwe> wrote

- quote -

> Diopter -6, BC 8.4, DIA 14.0
> I have fairly good vision with this prescription. Some problem at night
> as I
> have small amount of astigmatism burt overal not too bad.

"Fairly good" usually means "less than 20/20" or "less than it could be.

If your vision isn't excellent with contacts (especially if the left is
worse), it's reasonable that your glasses could be "right."

Glasses have reflections (double?) that don't occur with contacts.

The prescription you listed for glasses has no astigmatism correction.

It is common for young people to overcompensate during refraction, making
the prescription come out higher than it needs to be.

Your problems should be discussed with the prescribing doctor. I usually
repeat the refraction, especially to make sure that one notch less
correction is blurry.

- quote -

> Also, does it make sense to have such a DIFFERENCE between my contact and
> spectacle prescription?

It isn't typical to see this much difference, but we can't assume your
contacts were "right."

-MT

#-1 03-10-2006, 04:54 PM

My contact prescription is as follows:
Accuvue soft disposable lenses
Diopter -6, BC 8.4, DIA 14.0
I have fairly good vision with this prescription. Some problem at night as I
have small amount of astigmatism burt overal not too bad.

Recently I decided to get new eyeglasses done as I could not get good vision
from my current eyeglasses. The optometrist came up with the following:
Right eye: -7.00
Left eye:-7.50
High Index lens

With my new spectacles, my night vision especially when looking at car/street
lights is poor. Lights seem to have a double effect especially on my left
eye. Although day time vision is good, I seem to have trouble adjusting...
does nott 'feel' right.
Also, does it make sense to have such a DIFFERENCE between my contact and
spectacle prescription?
Please help!!

Similar Threads
Thread	Forum	Replies	Last Post
Contact Lens and Spectacle Industries Show Tremendous Growth doctor_my_eye@msn.com: One of the myths about LASIK is that it has "replaced" contact lenses. According to the November Issue of "Review of Optometry," the June 2005...	Lasik Eye Surgery	15	11-24-2005 10:32 PM
Polarized spectacle lenses - this sounds like BS to me Wooly: Following is a description of a recent problem I had with 1.6 high index Zeiss G15 polarized polycarbonate lenses. I have a query in with Zeiss...	Vision	6	12-24-2004 05:55 AM
Contact lens powers (spectacle Rx) thoughts and comments cliveP: Just reading on google and discovered that a Contact Lens Rx is different to a Spectacle Rx due to the vertex difference. Previously I had not...	Vision	5	10-07-2004 01:55 PM
contacts with cylinder component or contacts + glasses Eugene Phar: I have been wearing glasses for very long time (since my childhood). I have a severe myopia and thin retina. My recent prescription is OD -11.25 OS...	Main Category	7	08-23-2003 04:25 AM
contacts with cylinder component or contacts + glasses Eugene Phar: I have been wearing glasses for very long time (since my childhood). I have a severe myopia and thin retina. My recent prescription is OD -11.25 OS...	Vision	7	08-23-2003 04:25 AM

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode