adjusting eyelasses

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mg - 25 Nov 2004 14:07 GMT

According to the job description, an Optician
Heats, shapes, or bends plastic or metal frames to adjust eyeglasses to fit
client, using pliers and hands.
I wonder if the adjustment procedure is available anywhere online. How do
they determine the right fit?

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Dr Judy - 25 Nov 2004 19:13 GMT

> According to the job description, an Optician
> Heats, shapes, or bends plastic or metal frames to adjust eyeglasses to
> fit client, using pliers and hands.
> I wonder if the adjustment procedure is available anywhere online. How do
> they determine the right fit?

If you plan to buy your glasses online, be sure to ask the vendor how they
manage to check the fit of the frame before ordering, how they adjust them
on delivery and how they manage adjustments during the lifetime of the
glasses. If they have no answer, you have discovered one of the major
disadvantages to buying glasses online.

Dr Judy

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mg - 25 Nov 2004 20:34 GMT

>> According to the job description, an Optician
>> Heats, shapes, or bends plastic or metal frames to adjust eyeglasses to
[quoted text clipped - 9 lines]
>
> Dr Judy

Actually, I have bought glasses "offline". They are my first progressives.
I had them adjusted at the store twice, but the cener spot is still off.
This narrow area responsible for the medium range can produce sharp images
for each eye, but not quite at the same time for both eyes.

Learning the procedure might help me better adjust the glasses myslef. Not
to criticize the optician, I have a much better idea of what I see through
the glasses.

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Mark A - 25 Nov 2004 23:57 GMT

> Actually, I have bought glasses "offline". They are my first progressives.
> I had them adjusted at the store twice, but the cener spot is still off.
[quoted text clipped - 4 lines]
> to criticize the optician, I have a much better idea of what I see through
> the glasses.

It is not unusual for opticians to make mistakes in the fitting. In fact,
for progressives it is quite common. By fitting, I mean not only adjusting
the frame, but also making sure the lens is placed correctly in the frame
for optimum vision.

You need to have the lenses re-made so that they are placed correctly in the
frame (once the lenses are cut for the frame, they cannot be repositioned in
the frame). Do not compromise. DEMAND that they do a remake of the lenses.
Do not contort the frame to make the optical center in the correct position,
if it does not naturally fit that way. It would be best to get a the most
experienced optician in the store to do the fitting next time.

One primary reason that progressives cost so much is that they frequently
have to do remakes, or provide money back for those who cannot adapt. The
cost of the remakes is built-in to the profit margin.

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Mark A - 25 Nov 2004 21:53 GMT

> > According to the job description, an Optician
> > Heats, shapes, or bends plastic or metal frames to adjust eyeglasses to
> > fit client, using pliers and hands.
> > I wonder if the adjustment procedure is available anywhere online. How do
> > they determine the right fit?

Generally speaking, the correct fit is one that is comfortable, does not
slip, and is close to the eye as reasonable possible. The angle of the lens
should be slightly tilted forward (from top to bottom) to the correct angle
(assuming the temple is level, this is usually not a big problem).

After the frame is fit on the face correctly as described above, the frame
is measured so that the optical center of the lens will be placed in the
correct height for that particular frame as it sits on a particular patient
(this can vary somewhat depending on the type of lens design used). This
information is used along with pupil distance (PD) measurement to correctly
fit the lens in the frame.

The net is that the frame should be adjusted before the lens is made to
ensure a proper fitting.

Disclaimer: I am not an optician and the above is just a general description
of the process.

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