PUPILLARY DISTANCE

The PD or Pupillary Distance is the distance between your two eyes , center to center, the center of one pupil to the center of the other, in Millimeters.(1”= 25.4mm). Unfortunately most optometrists leave this quite necessary measurement off from your prescription, but you can measure this yourself.

You can measure this yourself in a mirror(not very accurate, and not generally recommended) or have a friend measure it for you by holding a ruler just under the pupils of your eyes and measuring the distance center to center. You should be looking straight forward fixing your focus at distant object, and not at the person measuring you.

Average is about 62mm, and most, 97% or so, fall within 54 to 74 range. If you are coming up with a number outside of this range consider that you might be making a measurement mistake.Do NOT just guess,or assume you're just an average 62,and DO NOT measure your old glasses to try to come with this number,.

Sometimes a prescription has two numbers, written such as PD 65/62 usually written on a bi-focal prescription. This means that 65 is your distance vision PD, and the one to be entered on our forms. And 62 is the reading or near vision PD, the one to be used only if you are ordering a plain reading glass only.
Occasionally a PD is written as ,for example, 32/34.5 which are the mesurements from the center of the nose to either eye, and your PD is the sum of the two, 32+34.5=66.5 and you can enter this as 66 or 67 it does not really matter.
If you are off by a millimeter or two it really does not matter, but try to be as accurate as you can especially for progressive prescription glasses
You should also be able to get your PD from your previous eyeglass supplier, this figure does not expire with age,they have to give it to you by federal law as well as your full prescription, it is your property.