Pupillary Distance?

Question

I went to get a diabetes eyecheck and they said I needed new glasses which is fine cause insurance will cover a pair but their prices were a little higher than the insurance even for their basic frame and the insurance would cover much less to update the lens. So I asked if I could shop around which they said sure. But the prescription has the pupillary distance blank and when they handed my old glasses back to me, the numbers on the left arm were sanded down ( I have two pairs so I still have the numbers ). I can't rule out someone else sanding them down but it's not like I've shopped for glasses before. Anyways, after reading criticisms of your Internet retailers suggest you measure pupillary distance, I took two lottery tickets and over lapped the corners forming two points pointing up. I brought this to the bridge of my nose and looked at a distant and near object sliding the tickets till the points united at the object giving me 59 mm for the near object and 63 mm for the distant. I'm going to go back and ask why the field is blank but is my method reasonable from an optician's perspective.

Update:

Edit:

I read that the ruler on the face and phone apps weren't reliable and that it was better to mark dots on your glasses with a felt pen when it lined up with what you saw, so I came up with the two corners of paper thing that I did. I also read that the difference between far and near was 3 to 4 mm which corresponded with my measurements.

Flying Dragon · Accepted Answer

Strangely, the law says they have to provide you with a copy of the prescription but they DON'T have to give you the PD, technically, it isn't part of the prescription (at least according to them anyway). You can also have a friend measure your PD with a ordinary metric ruler and some of the on-line eyeglasses sites have various ways of doing it. Note: if they have you print out some kind of scale on paper to measure the PD, make sure to check it with a ruler first as sometimes the computer or printer changes the size. The numbers on the temples (arm) are the lens width, bridge width & temple length (in mm), there usually is a brand & model# too, they don't stamp your prescription on the frames). By the way, 63 is a very average PD for distance, I don't know if it is correct but it is a very typical number. Generally, the near PD is about 3 mm less than the distance one; yours is 4 less, but probably OK within "experimental error". If you have a fairly weak prescription, it won't matter if you are off a mm one way or the other, if you have really strong glasses, you might want to pay the extra money to get the PD measured and glasses properly fitted to avoid distortion, headaches, etc.

Anonymous · Answer

The PD is very important if you have a high prescription (strong lenses), if its incorrect the glasses may give you headaches. It is not part of the prescription, it is the responsibility of the person fitting the glasses. Of course the optometrist does not want you to buy glasses on line, the true cost of providing an eye test is usually much more than the fee charged. If too many people buy their glasses on line, opticians will have to charge an economic eye test fee, say about £50, or go out of business. Will you then get your eyes tested on-line?

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Pupillary Distance?

3 Answers