How to find your Pupillary Distance and Ocular Height

Your pupillary distance or PD, is simply the distance between the centre of your pupils.

Your PD is an important part of your glasses prescription that makes sure the center of your eyes are in line with the focal point in your lenses. It's helpful to have this measurement if you’re buying your specs with us, especially if you have a higher prescription (over +2.00 or -2.00).

Measuring your Pupillary Distance

You can measure your PD yourself by downloading our PD measuring tool below. Once printed, simply follow the step-by-step guide.


Download the PD measuring tool here

Measure your dual PD (Pupillary distance)

For any prescription lenses, it’s helpful to know your PD measurement.

Use the PD tool with either a mirror or an assistant (you’ll see there is one side of the tool marked out for each)

Hold both ends and place PD tool on on the centre of your nose.

Measure from the 0 to the centre of each pupil and take a note of each measurement.

These might be slightly different for each eye.

Ask a friend to help if needed.

Record these measurements like this:

PD:
L: 31mm
R: 32.5mm (example)
*Combine your dual numbers to get your total PD (63.5mm)

Measuring your Ocular Height or OC

If you need varifocal lenses, we’ll need your OC measurements as well as your PD measurments. Your OC measurement must be taken with the frames you’re ordering lenses for.

Download PD & OC Measuring Instructions here


Measure your OC

Stand in front of a mirror (about 1 foot away or close enough to read a ruler).

Hold a plastic ruler vertically against the frame and center the 0 in the middle of your pupil.

Measure the distance from the centre of your pupil to the bottom edge of the lens (not the edge of the frame).

Record the height for each eye.

These might be slightly different for each eye.

Ask a friend to help if needed.

Record these measurements like this:

OC:
L: 21mm
R: 22mm (example)

Still have questions? No problem, we can help you. Just catch us on live chat or email us a note using the link below.

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