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Subject

Author

Date

01-10-2010

Posted by on January 10, 2010, 6:29 pm

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Been thinking on giving them a try.

I have recent prescription but not a measurement for PD
or whatever it is called.

Advice?

Posted by The Real Bev on January 10, 2010, 7:05 pm

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me@privacy.net wrote:

> Been thinking on giving them a try.

> I have recent prescription but not a measurement for PD

> or whatever it is called.

> Advice?

Don't they give instructions?

If you live near Yuma you might want to try Algodones Optical just over the
border in Mexico.

--
Cheers, Bev
Far away in a strange land

Posted by Rod Speed on January 10, 2010, 10:26 pm

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me@privacy.net wrote:

> Been thinking on giving them a try.

> I have recent prescription but not a measurement for PD or whatever it is

called.

> Advice?

Do you have any glasses you dont use anymore lying around ?

They should be able to use those to work it out.

Posted by Jim Prescott on January 11, 2010, 2:20 pm

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>I have recent prescription but not a measurement for PD

>or whatever it is called.

Zenni has info on how to measure PD. Try clicking the ? on the entry
form, or looking at the FAQ on prescriptions.

PD is the distance between your pupils. You measure it by holding a
ruler up to your eyes. It is hard to get an accurate measure on
yourself, you need someone else to read the ruler. There is also a
differences between near and far focus, you want the one appropriate
to the glasses you are ordering.
--
Jim Prescott Edmund A. Hajim School of Engineering and Applied Sciences
jgp@seas.rochester.edu University of Rochester, NY

Posted by Rod Speed on June 27, 2010, 4:44 pm

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Jim Prescott wrote

>> I have recent prescription but not a measurement for PD or whatever it is

called.

> Zenni has info on how to measure PD. Try clicking the ?

> on the entry form, or looking at the FAQ on prescriptions.

> PD is the distance between your pupils.

> You measure it by holding a ruler up to your eyes.

> It is hard to get an accurate measure on yourself,

Yeah, I tried that myself, then found it on one of the older prescriptions.

I was a couple of mm out.

> you need someone else to read the ruler. There is also

> a differences between near and far focus, you want the

> one appropriate to the glasses you are ordering.

Its easy to convert between one and the other, there is a 3 mm difference.

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