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Not sure about legality but here in the UK you will find opticians will give you your prescription, but often exclude the pupil distance measurement (I think) w

Not sure about legality but here in the UK you will find opticians will give you your prescription, but often exclude the pupil distance measurement (I think) which a lot of the online stores require. I think you can ask for it, but they will only give it begrudgingly.

FPGAhacker 7y ago
Inter-pupillary distance is among the few things glasses related that can be measured yourself.
- vanattab 7y ago
  It's a little hard to measure it by yourself but with a friend it's easy. Just make sure your looking far off into the distance and not at the persons face who is taking the measurement.
  - JiBB 7y ago
    I found that the best way to get a nice, precise measurement was to take two pieces of sticky note and punch a hole in them with a pin. Put them on an existing pair of glasses and line up a distant (unless you're getting reading glasses) sharp corner with the pinhole over one eye. Switch to the other eye and see if the pinhole is lined up—if not, adjust the pinhole positioning and try again. Once the pinholes are aligned, you can measure the distance between them. Much easier than trying to get someone to measure it accurately with a ruler in front of your face, or trying to draw dots with a washable pen in front of your eyes on old glasses, or any of the other methods I tried. The measurement I took appears to be accurate (the glasses I ordered from Zenni using it are comfortable to wear), and it was easy to get a precise and repeatable measurement to within about half a millimeter.
- jfengel 7y ago
  That may take some practice. I did it myself once, and was off by about 4 mm. The resulting glasses were incredibly painful. My eyes would try to look in two slightly different directions, and my brain would put the wrong 3D picture together. Whenever I moved my head my eyes would readjust, which took a noticeable period of time, and I could literally feel my non-dominant eye turning itself to find the focus. I chucked the glasses after a few days. I'm sure it could be done better, but boy, that was an interesting experience I hope to never repeat.
  - davinic 7y ago
    When I bought online from Zenni optical they sent a plastic ruler that you set on the bridge of your nose with a slot in the middle, and can be used to measure PD. It's similar to this: https://store.eyeque.com/eyeque-pd-ruler.html https://store.eyeque.com/eyeque-pd-ruler.html
    - jfengel 7y ago
      Thanks for the tip. That would be way easier than doing it with a plastic school ruler.
tonyarkles 7y ago
I encountered this in Canada, with an explanation given to me that there was a lawsuit at some point where an optometrist was sued after a client ordered glasses elsewhere based on the provided IPD and got glasses that caused headaches or something like that. From Wikipedia[1]: > In both the UK and most of Canada (excluding British Columbia[5]), the PD measurement is classed as a dispensing tool rather than a part of the actual prescription of the person whose eyes were tested, thus there is no obligation for a PD to be provided on patient request. [1] https://en.wikipedia.org/wiki/Pupillary_distance https://en.wikipedia.org/wiki/Pupillary_distance
- diroussel 7y ago
  As part of GDPR you can request a copy of any personal data. In the UK this is governed by the ICO, and it’s called Right of Access. https://ico.org.uk/for-organisations/guide-to-data-protection/guide-to-the-general-data-protection-regulation-gdpr/individual-rights/right-of-access/ https://ico.org.uk/for-organisations/guide-to-data-protectio...
  - icebraining 7y ago
    Are you assuming they keep records on the PD measurements of clients who didn't actually purchase glasses there? At least at the opticians I've used, I don't think they do.
  - astura 7y ago
    You get your PD measured at the time you order your glasses. If you never order glasses they'll never measure your PD.
cptskippy 7y ago
In the US, the person who takes your pupil distance (PD) usually isn't the person who writes your prescription. One is a doctor and the other a technician. When you go to an optician, the doctor takes you in the back and determines your prescription. Then you go out front to the showroom and pick out your frames. There is usually a technician out there who will take the PD measurement and combine it with the prescription, and frame and lens selection to make your order. The technician is also the person who fits you with the new glasses when they arrive.
kshacker 7y ago
I recently (in US) asked for it, and was given a hand written sticky, begrudgingly after asking why you need it. But once asked again, no further objection.
- kube-system 7y ago
  Your PD isn’t part of the prescription. But the prescription itself must be provided to you by law in the US.
  - fitzroy 7y ago
    For anyone near a Warby Parker, they'll happily measure your PD in about 30 seconds. Measurements can vary slightly so you might want to do it a few times and average them.
    - carbocation 7y ago
      You can also do it online with Warby Parker as long as you have a credit card (to hold under your face; not to pay with).
      - pkaye 7y ago
        Now that is a clever way of doing it!
      - DesiLurker 7y ago
        do they also need the picture of the backside and home zipcode? if not, sounds like a startup idea.
    - tacon 7y ago
      The PD also varies a bit from reading glasses to distance glasses. If you are ordering single vision glasses, you might want to collect both numbers.
- breakbread 7y ago
  Weird. I’m in Mississippi, of all places, and, without asking, my optometrist always sends me off with a printout containing my prescription and PD.
astura 7y ago
That's cause PD is measured by the optician separately when you're ordering your glasses, not by the optometrist or opthalmologist who writes the prescription. In other words, it's not part of the prescription, it's instead part of the glasses fitting process. A non-eye related example would be if your doctor prescribed you a brace and the person at the medical supply store measured you to find out which size you need.
- JoeAltmaier 7y ago
  ...and can be measured at home using a ruler and a mirror, pretty simply. Close one eye, align the ruler at 0 under that pupil. Open the other eye, close the first, read off the distance to the 2nd pupil.
  - nsxwolf 7y ago
    Did this for my wife recently. We measured multiple times very carefully, and got it very wrong.
    - andai 7y ago
      Did it for myself. Ordered online. Best glasses yet (I think mainly thanks to a my very patient optometrist.) I measured by taking a picture of my face with a credit card for reference and measuring the pixels with the measuring tool in GIMP. (These were the actual instructions on the website I ordered my glasses from.) Also worth mentioning I paid $40 ordering them online, in the article it says he paid $280!
      - nicolapede 7y ago
        May I ask you where you ordered them?
        andai 7y ago
        Edit: Just found out they ship worldwide for €3. https://www.glasses24.com/customer-support/shipping-and-delivery https://www.glasses24.com/customer-support/shipping-and-deli... I was amazed because until a friend told me about this site, I've been paying hundreds of euros just for the frames! At such a low cost, I could even order slight variations on the strength. They have a lot of options for better lens material, have it darken in sunlight, anti glare coating etc, but I just got the cheapest one and it was fine.

FPGAhacker 7y ago

Inter-pupillary distance is among the few things glasses related that can be measured yourself.

vanattab 7y ago
It's a little hard to measure it by yourself but with a friend it's easy. Just make sure your looking far off into the distance and not at the persons face who is taking the measurement.
- JiBB 7y ago
  I found that the best way to get a nice, precise measurement was to take two pieces of sticky note and punch a hole in them with a pin. Put them on an existing pair of glasses and line up a distant (unless you're getting reading glasses) sharp corner with the pinhole over one eye. Switch to the other eye and see if the pinhole is lined up—if not, adjust the pinhole positioning and try again. Once the pinholes are aligned, you can measure the distance between them. Much easier than trying to get someone to measure it accurately with a ruler in front of your face, or trying to draw dots with a washable pen in front of your eyes on old glasses, or any of the other methods I tried. The measurement I took appears to be accurate (the glasses I ordered from Zenni using it are comfortable to wear), and it was easy to get a precise and repeatable measurement to within about half a millimeter.
jfengel 7y ago
That may take some practice. I did it myself once, and was off by about 4 mm. The resulting glasses were incredibly painful. My eyes would try to look in two slightly different directions, and my brain would put the wrong 3D picture together. Whenever I moved my head my eyes would readjust, which took a noticeable period of time, and I could literally feel my non-dominant eye turning itself to find the focus. I chucked the glasses after a few days. I'm sure it could be done better, but boy, that was an interesting experience I hope to never repeat.
- davinic 7y ago
  When I bought online from Zenni optical they sent a plastic ruler that you set on the bridge of your nose with a slot in the middle, and can be used to measure PD. It's similar to this: https://store.eyeque.com/eyeque-pd-ruler.html https://store.eyeque.com/eyeque-pd-ruler.html
  - jfengel 7y ago
    Thanks for the tip. That would be way easier than doing it with a plastic school ruler.

tonyarkles 7y ago

I encountered this in Canada, with an explanation given to me that there was a lawsuit at some point where an optometrist was sued after a client ordered glasses elsewhere based on the provided IPD and got glasses that caused headaches or something like that. From Wikipedia[1]: > In both the UK and most of Canada (excluding British Columbia[5]), the PD measurement is classed as a dispensing tool rather than a part of the actual prescription of the person whose eyes were tested, thus there is no obligation for a PD to be provided on patient request. [1] https://en.wikipedia.org/wiki/Pupillary_distance https://en.wikipedia.org/wiki/Pupillary_distance

diroussel 7y ago
As part of GDPR you can request a copy of any personal data. In the UK this is governed by the ICO, and it’s called Right of Access. https://ico.org.uk/for-organisations/guide-to-data-protection/guide-to-the-general-data-protection-regulation-gdpr/individual-rights/right-of-access/ https://ico.org.uk/for-organisations/guide-to-data-protectio...
- icebraining 7y ago
  Are you assuming they keep records on the PD measurements of clients who didn't actually purchase glasses there? At least at the opticians I've used, I don't think they do.
- astura 7y ago
  You get your PD measured at the time you order your glasses. If you never order glasses they'll never measure your PD.

cptskippy 7y ago

In the US, the person who takes your pupil distance (PD) usually isn't the person who writes your prescription. One is a doctor and the other a technician. When you go to an optician, the doctor takes you in the back and determines your prescription. Then you go out front to the showroom and pick out your frames. There is usually a technician out there who will take the PD measurement and combine it with the prescription, and frame and lens selection to make your order. The technician is also the person who fits you with the new glasses when they arrive.

kshacker 7y ago

I recently (in US) asked for it, and was given a hand written sticky, begrudgingly after asking why you need it. But once asked again, no further objection.

kube-system 7y ago
Your PD isn’t part of the prescription. But the prescription itself must be provided to you by law in the US.
- fitzroy 7y ago
  For anyone near a Warby Parker, they'll happily measure your PD in about 30 seconds. Measurements can vary slightly so you might want to do it a few times and average them.
  - carbocation 7y ago
    You can also do it online with Warby Parker as long as you have a credit card (to hold under your face; not to pay with).
    - pkaye 7y ago
      Now that is a clever way of doing it!
    - DesiLurker 7y ago
      do they also need the picture of the backside and home zipcode? if not, sounds like a startup idea.
  - tacon 7y ago
    The PD also varies a bit from reading glasses to distance glasses. If you are ordering single vision glasses, you might want to collect both numbers.
breakbread 7y ago
Weird. I’m in Mississippi, of all places, and, without asking, my optometrist always sends me off with a printout containing my prescription and PD.

astura 7y ago

That's cause PD is measured by the optician separately when you're ordering your glasses, not by the optometrist or opthalmologist who writes the prescription. In other words, it's not part of the prescription, it's instead part of the glasses fitting process. A non-eye related example would be if your doctor prescribed you a brace and the person at the medical supply store measured you to find out which size you need.

JoeAltmaier 7y ago
...and can be measured at home using a ruler and a mirror, pretty simply. Close one eye, align the ruler at 0 under that pupil. Open the other eye, close the first, read off the distance to the 2nd pupil.
- nsxwolf 7y ago
  Did this for my wife recently. We measured multiple times very carefully, and got it very wrong.
  - andai 7y ago
    Did it for myself. Ordered online. Best glasses yet (I think mainly thanks to a my very patient optometrist.) I measured by taking a picture of my face with a credit card for reference and measuring the pixels with the measuring tool in GIMP. (These were the actual instructions on the website I ordered my glasses from.) Also worth mentioning I paid $40 ordering them online, in the article it says he paid $280!
    - nicolapede 7y ago
      May I ask you where you ordered them?
      - andai 7y ago
        Edit: Just found out they ship worldwide for €3. https://www.glasses24.com/customer-support/shipping-and-delivery https://www.glasses24.com/customer-support/shipping-and-deli... I was amazed because until a friend told me about this site, I've been paying hundreds of euros just for the frames! At such a low cost, I could even order slight variations on the strength. They have a lot of options for better lens material, have it darken in sunlight, anti glare coating etc, but I just got the cheapest one and it was fine.