My PD measurement changes each time. What should I do?

Measure 2–3 times, keep your head level, and use the average. If the range is large, ask a friend or an optician.

Is PD different for reading vs distance?

It can be. Some prescriptions include a separate near PD. If your order only asks for one PD, use the one provided for that purpose.

What if my prescription doesn’t include PD?

You can measure pupillary distance at home using the steps above or request PD from your eye care provider.

What if my PD measurement is not a whole number or seems irregular?

It's very common for PD measurements to include a decimal (e.g., 62.2, 62.7) or to be slightly different between your left and right eyes. If your PD is not a whole number, please round it to the nearest option available: - If your PD is 62.2, please select 62 - If your PD is 62.7, please select 62.5 - If your monocular PD is 31.1, please select 31 If you have a significant difference between your left and right eye PD (more than 2–3mm), or if you’re unsure about your measurement, we recommend visiting a local optician for a professional PD check. This ensures your glasses are made to fit you correctly.

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How to Measure Your PD

How to Measure Your Frame Size

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How To Adjust Your Eyeglasses

What is Pupillary Distance (PD)?

Pupillary distance (PD) is the distance between the centers of your pupils, measured in millimeters (mm). A correct PD measurement helps align the optical center of your lenses for clearer, more comfortable vision.

Why It Matters

Accurate PD distance improves lens centering and helps reduce visual discomfort.

Single vs. Dual PD

Some orders use one number, others use two (OD/OS) for right and left eye.

How to Measure Your PD

Prefer a visual walkthrough? This short video shows how to measure pupillary distance with a PD ruler, plus tips to keep your PD measurement consistent.

Printable PD Ruler

Print this page at 100% / Actual size on A4 paper or US letter paper. For the most accurate results, measure 2–3 times and use the average.

Download PD Ruler

Note: Please print at 100% size on A4 / US letter paper.

How to Measure Your PD at Home

The average adult PD is usually between about 54 mm and 78 mm. For the most accurate result, measure 2–3 times and use the average.

Step 1
Stand about 8 inches (20 cm) from a mirror. Keep your head level and look straight ahead.
Step 2
Close your right eye. Align the “0” mark on the ruler with the center of your left pupil.
Step 3
Close your left eye. Read the millimeter number that lines up with the center of your right pupil.
Step 4
If you need dual PD, measure each eye separately (OD/OS) and enter both numbers.

Single vs. Dual PD (OD/OS)

Use single PD when checkout shows one PD field. Use dual PD when checkout asks for two PD fields (right/left).

Type	What It Looks Like	When To Use
Single PD	One number (e.g., 63mm)	When checkout shows one PD field
Dual PD	Two numbers (e.g., OD 31mm / OS 32mm)	When checkout asks for two PD fields (right/left)

Can You Measure PD Online?

Yes. Online tools can help you estimate your pupillary distance. For the best accuracy, especially with a stronger prescription, consider getting PD measured by an eye care professional.

Option 1

Use a photo tool (phone or webcam)

Use a standard card for scale. Keep your face centered, look straight ahead, and use good lighting.

Option 2

Use a printable PD ruler (recommended)

Print at 100% / actual size, then follow the step-by-step guide above for a more reliable PD distance.

Option 3

Ask a friend to measure for you

A helper can improve accuracy because you can keep both eyes open and your head steady.

FAQ

Measure 2–3 times, keep your head level, and use the average. If the range is large, ask a friend or an optician.
It can be. Some prescriptions include a separate near PD. If your order only asks for one PD, use the one provided for that purpose.
You can measure pupillary distance at home using the steps above or request PD from your eye care provider.
It's very common for PD measurements to include a decimal (e.g., 62.2, 62.7) or to be slightly different between your left and right eyes. If your PD is not a whole number, please round it to the nearest option available:
If your PD is 62.2, please select 62
If your PD is 62.7, please select 62.5
If your monocular PD is 31.1, please select 31
If you have a significant difference between your left and right eye PD (more than 2–3mm), or if you’re unsure about your measurement, we recommend visiting a local optician for a professional PD check. This ensures your glasses are made to fit you correctly.

CONFIGURE YOUR GLASSES

Select Your Frames

Select Lenses

Customize Your Lenses

Complete the Order

What is Pupillary Distance (PD)?

Why It Matters

Single vs. Dual PD

How to Measure Your PD

Printable PD Ruler

How to Measure Your PD at Home

Single vs. Dual PD (OD/OS)

Can You Measure PD Online?

Use a photo tool (phone or webcam)

Use a printable PD ruler (recommended)

Ask a friend to measure for you

FAQ

My PD measurement changes each time. What should I do?

Is PD different for reading vs distance?

What if my prescription doesn’t include PD?

What if my PD measurement is not a whole number or seems irregular?

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