One of the most common questions we receive is:
"What is my PD?"
PD stands for Pupillary Distance, which is simply the distance between the centers of your pupils.
This measurement helps position your lenses correctly so you see clearly and comfortably through the optical center of each lens.
The good news is that measuring your PD is usually quick and easy.
Why does PD matter?
Your prescription tells us how your lenses should correct your vision.
Your PD tells us where those lenses should be positioned.
Both measurements work together to give you the clearest vision possible.
A correct PD can help ensure:
- Comfortable vision
- Reduced eye strain
- Proper lens alignment
- The best overall performance from your glasses
There are several ways to find your PD
The easiest options include:
Your previous prescription
Some eye doctors include your PD on your prescription.
If it's there, you're all set.
Ask your eye doctor
If your PD isn't listed, your eye doctor's office may already have it on file.
Many offices are happy to provide it if you ask.
Measure it yourself
You can also measure your PD at home using a ruler or a printable PD ruler.
This usually takes only a few minutes.
For the most accurate results:
- Look straight ahead.
- Keep your head level.
- Measure in millimeters.
- Repeat the measurement two or three times to make sure it is consistent.
Don't worry if you're unsure
If you're not confident in your measurement, don't panic.
Many customers feel the same way the first time they order glasses online.
That's why we've created simple guides and measurement tools to help make the process easier.
If you still have questions, we're happy to help.
A few tips
- Measure in good lighting.
- Ask someone to help if possible.
- Take multiple measurements and use the average.
- Double-check before placing your order.
A few extra seconds can make a big difference.
The Bottom Line
Measuring your PD isn't difficult, and once it's done, you usually won't need to think about it again until you order another pair of glasses.
If you take your time and follow the instructions, you'll have the information needed to order your glasses with confidence.