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Pupillary distance – also known as interpupillary distance – is a measure of the distance between a subject’s pupils.
This measurement is factored into the creation of corrective lenses to help locate the optical center of the lenses. Millimeters are the measurement unit used as the industry standard.
Pupillary distance can be measured by machine – a “corneal reflex pupillometer” – or with a millimeter ruler by any optometrist or optical assistant. It can also be measured by you at home with a small ruler, if you’re careful. The pupillary distance measurement does not have to be 100% precise to be useful, as it can tolerate a fairly small error range. If you do measure your own pupillary distance, it is recommended that you try several attempts to be sure you get a fairly accurate measurement.
To give you an idea of the kind of measurement readings you should get, here are the typical ranges for various groups:
If you recently had an eye exam and were given a written prescription, or have an older prescription on file, the prescription may already indicate your pupillary distance. If it does not, you’ll need to obtain that measurement. To do it yourself, follow these steps:
The online tools I am using keep coming up with 55.5 but my prescription says 62. Which should I use?
If you have a prescrption with it on there i would use the prescription
An older doctor told me my ipd was 60. However, I recently just measured it out myself to about 66 or 67mm. I ordered two pair of glasses with the old value of 60. Will these glasses be ok for me or will it cause problems?
I put my PD at 65 and then I found an old prescription and it was 63 will I be ok on this?
So I have two values on an older prescription, but it says 65/24. I thought about the Dual PD but it couldn’t be since 65 is the single PD. What does it mean?
If you have progressive bifocals, it sounds like the 24 is the segment height for your frames.
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