What Is Pupillary Distance

What Is Pupillary Distance?

Pupillary Distance (PD) is the distance, in millimeters, between the center of one pupil to the center of the other. The PD is needed to manufacture your eyeglasses because it determines the exact optical center of the lens, which is the point where you look through the lens.

How to Measure Your PD on Your Own

To measure on your own, you will need a mirror and our special ruler. Measuring with a friend is the preferred method. If you have a friend available, scroll up for our how to measure with a friend tutorial.

STEPS

1 Print our tip sheet, which includes a special ruler to measure your PD. Ensure it's scaled properly by comparing your Driver's License against the key.

2 Stand in front of a mirror approximately 8 inches away or more. Hold the center of the special ruler straight over the bridge of your nose.

3 To measure your right eye, stare straight ahead and close your left eye and note the mm mark on the ruler directly above the center of your right pupil.

4 To measure your left eye, stare straight ahead and close your right eye and note the mm mark on the ruler directly above the center of your left pupil.

5 Repeat this process at least three times to ensure you have an accurate measurement.

How to Measure Your PD Using an App (New & Easy)

If you’d like to submit a photo of your Prescription, or a photo of you wearing your current glasses (for Progressive and Lined Bifocal orders): Click on the link at the top right of the page to get to your account. Then, click on “Your Orders”. After that, choose the order you just placed and click on “View Details”. Finally, select “Share Pic With Lab” to upload your photo(s) Keep in mind that we work to get your eyeglasses to you in the shortest time possible, so the lab will start working on your glasses within hours of your order. If you need to submit a photo or change your order, make sure you do it very soon after your order has been placed.

STEPS

1 If you don't have the app on the phone, get it here from the app store.

2 Launch the EyeMeasure app and look into the camera.

3 Note down the "Far PD" shown on the app.

4 Repeat at least three times to ensure you have an accurate measurement.

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