Pupillary Distance

What is PD (Pupillary Distance)?

PD is the approximate distance between the centre of one of your pupils to the other. This value differs from person to person and also depends on whether they are looking at nearby or far away objects.

The PD is used to help centre a prescription correctly in your frames. If the PD is wrong, or as we say in the optical world “out of tolerance,” you won’t be able to focus your eyes together properly. That’s why it is important to make sure that your PD is as accurate as possible.

Before using our PD tool, please review the steps below.

How to measure your PD

1. Remove your glasses if your are still wearing them

It also helps to be in a well-lit area with a clean background.

2. Adjust your screen and look directly at the camera.

It should be positioned straight on with your face centered.

3. Place any card with a magnetic strip under your nose and snap a photo.

Make sure the card is touching your face, with the strip facing outward and right side up.

Measure your PD

Pupillary Distance

Pupillary Distance & Segement Height Measurement


Upload an image

Adjust the red line width to the card magnetic tape:

Rotate the red line in case your photo is diagonal:


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