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Most of prescriptions provide PD number. If the prescription without PD, you can ask optometrist to provide it.
At worst, if your prescription didn't include your Pupillary Distance, and no way to obtain it from your optometrist. You'll still need to know it before you order your STMUSE glasses.
Don’t worry. We'll teach you how to measure it without Eyecare Professional!
PD, or Pupillary Distance, refers to the distance in millimeters between the center of one pupil to the center of the other. PD number is an important value to determine how to place your lenses in your frame.
If PD number was not provided on your prescription, please ask your doctor or optometrist kindly. They should have your PD number on file.
You can also measure your PD by yourself.
We strongly recommend you to consult your doctor or optometrist to get the PD if your prescription without PD number.
Measure PD yourself for Single Vision Prescription
1. Print our Downloadable Paper PD Ruler or order a specialized plastic PD ruler.2. Place the ruler directly over the center of your right pupil so that the ruler is horizontal. Place against forehead for added stability. Stand in front of a mirror, or ask someone else to measure for you.
3. While looking straight ahead, measure the distance from the center of your right pupil to the center of your left pupil.
4. Repeat a couple of times for accuracy and use an average for your final measurement. (At least three times.)
*Note that the average PD is between 57 and 65mm. For Progressive lenses and Bifocal Lenses, two PD values are needed. In these cases, STMUSE recommends getting your PD directly from your eye care professional