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Prescription help
Pupillary Distance
Before you order prescription lenses, you'll need your pupillary distance (PD). It's often printed on your prescription — and if it isn't, you can measure it at home in a couple of minutes with our printable ruler.
What is pupillary distance?
Pupillary distance (PD) is the distance in millimeters between the centers of your pupils. It's a required part of filling any prescription: it positions the optical center of each lens exactly in front of your eye, so you look through the right part of the lens.
Where do I find my PD on my prescription?
Your PD may or may not be listed on your prescription. It's usually written as one number, but it can also appear as two separate numbers — that's a dual PD.
Single PD is the distance from the center of one pupil to the center of the other, written as one number.
Dual PD is measured from the center of each pupil to the center of your nose, so it's written as two numbers. The first is always the right eye (OD), the second the left eye (OS).
You can enter either a single or dual PD when you build your pair. If your PD isn't on your prescription, measure it with our printable ruler using the steps below, or ask your eye care provider — they can give it to you in seconds.
The easiest way: have someone read the ruler for you.
No helper? You can do it yourself.
Most adults measure somewhere between 57 and 65 mm. There's no single “normal” PD — everyone is different, and the number varies widely from person to person.
No — your PD isn't on your frames. Look for it on the prescription from your eye care professional. If it isn't listed there, follow the steps above to measure it.
PD changes as you grow. Once you've stopped growing it stays essentially the same, changing only slightly if at all.
No. PD only affects how your lenses are cut and positioned — it has no effect on the frame size you should choose. Use our sizing guide to find your fit.
Either works. Enter whichever your prescription lists. If you measured at home with the ruler, you'll have a single PD.
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