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Prescription help
Pupillary Distance
Before you order prescription lenses, you’ll first need to know your pupillary distance (PD). You may find your PD on your current prescription, but don't worry if it’s not included – we’ll walk you through the process.
What is pupillary distance?
Pupillary distance (PD) measures the distance in millimeters between the center of each pupil. This required measurement is an important part of correctly filling your prescription, it is used to position the optical center of the lens accurately in your frames.
Where do I find my PD on my prescription?
Your PD may or may not be listed on your prescription. It’s normally listed as one number, but can also be written as two separate numbers. Two numbers refer to 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).
If your pupillary distance isn't provided on your prescription, you can either use our PD ruler to measure the distance or contact your eye care provider.
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.
Your PD will not be found on your physical frames. Instead, you may find it on your prescription given to you by your eye care professional. If not, please follow the steps above to help you find your PD!
A person’s PD will change over time as they grow and mature. But once they stop growing, PD’s may change slightly or may not change at all.
No. PD only affects how your lenses are cut and positioned - it has no effect on the frame shape or size you should choose.
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