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Eyeglass specifications Peetie Wheatstraw 03-04-2008
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Posted by Peetie Wheatstraw on March 4, 2008, 10:54 pm

This is a "shot in the dark" ...

I broke an eyeglass frame and need to order a replacement, possibly
on the web.

It evidently requires specifications like:

Eye Size: 50mm
Bridge Size: 13mm
Vertical Measurement: 40mm
Horizontal Measurement: 48mm
Temple Length: 130mm

Those specs were lifted from an Ebay offering.

How can I find specifications on an existing pair of eyeglasses?
Any info/suggestions much appreciated.

Peetie

Posted by EXT on March 4, 2008, 11:06 pm
Eyeglasses are dictated by fashion. The lens must be cut to fit the unique
shape of the frame, which is not part of the specification and different for
virtually every frame made. Go to a "good" eyeglass store or the one you
originally bought them from and see if they can identify the make and model
and if it is still available to order a replacement.

>
> This is a "shot in the dark" ...
>
> I broke an eyeglass frame and need to order a replacement, possibly
> on the web.
>
> It evidently requires specifications like:
>
> Eye Size: 50mm
> Bridge Size: 13mm
> Vertical Measurement: 40mm
> Horizontal Measurement: 48mm
> Temple Length: 130mm
>
> Those specs were lifted from an Ebay offering.
>
> How can I find specifications on an existing pair of eyeglasses?
> Any info/suggestions much appreciated.
>
> Peetie



Posted by on March 5, 2008, 8:05 am
On Wed, 05 Mar 2008 05:50:54 -0600, letterman@invalid.com wrote:

>wrote:
>
>>Eyeglasses are dictated by fashion. The lens must be cut to fit the unique
>>shape of the frame, which is not part of the specification and different for
>>virtually every frame made. Go to a "good" eyeglass store or the one you
>>originally bought them from and see if they can identify the make and model
>>and if it is still available to order a replacement.
>>
>I always try to DIY but I agree that this is a job that requires a
>pro. The frames are the cheapest part of glasses since they are mass
>produced. The lenses are custom cut for each person,

That has not been true since the advent of plastic lenses, and
probably before that.

Plastic lenses are molded, not ground. All those places that advertise
"eyeglasses in about an hour" keep a stockroom filled with premade
lenses in all the most common prescriptions. They are completely
round, as are any lenses an optometrist custom orders. The eyeglass
place takes the round blank in the proper prescription, and cuts it to
fit the particular frames. Those "in an hour places" have a disclaimer
in small print that says that "in one hour" applies to "most
prescriptions". If they are out of your prescription, or it truly is a
weird one, you won't get them in an hour, because they have to get
them either from the manufacturer, another branch store, or the store
chain's main warehouse.

The markup on both lenses and frames is HUGE, so stocking one or two
deep in every standard prescription is not that big of an investment.
It probably costs a gas station more to refill it's tanks.



Posted by on March 5, 2008, 9:32 am
On Mar 5, 8:05=A0am, sa...@dog.com wrote:
> On Wed, 05 Mar 2008 05:50:54 -0600, letter...@invalid.com wrote:
> >I always try to DIY but I agree that this is a job that requires a
> >pro. =A0The frames are the cheapest part of glasses since they are mass
> >produced. =A0The lenses are custom cut for each person,
>
> That has not been true since the advent of plastic lenses, and
> probably before that.
>
> Plastic lenses are molded, not ground.

The lenses are CUT to shape to fit the frames and to have their center
of focus match your own eye spacing. They must be custom CUT for each
person. The machine that does this by GRINDING down the edge of a
round lens.

Posted by on March 5, 2008, 10:26 am
On Wed, 5 Mar 2008 06:32:26 -0800 (PST), mkirsch1@rochester.rr.com
wrote:

>On Mar 5, 8:05 am, sa...@dog.com wrote:
>> On Wed, 05 Mar 2008 05:50:54 -0600, letter...@invalid.com wrote:
>> >I always try to DIY but I agree that this is a job that requires a
>> >pro.  The frames are the cheapest part of glasses since they are mass
>> >produced.  The lenses are custom cut for each person,
>>
>> That has not been true since the advent of plastic lenses, and
>> probably before that.
>>
>> Plastic lenses are molded, not ground.
>
>The lenses are CUT to shape to fit the frames and to have their center
>of focus match your own eye spacing. They must be custom CUT for each
>person. The machine that does this by GRINDING down the edge of a
>round lens.

Please try to follow along, and make sure you comprehend what you are
reading before posting a reply.

Here is part of my post that you aparently snipped without reading it
first:

All those places that advertise "eyeglasses in about an hour" keep a
stockroom filled with premade lenses in all the most common
prescriptions. They are completely round, as are any lenses an
optometrist custom orders. The eyeglass place takes the round blank in
the proper prescription, and cuts it to fit the particular frames.



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