How To Measure Your PD | Vooglam

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Tips & GuideAnti-blue LensesLenses & CoatingFeatures of Shade LensesBifocal Lenses VS Progressive LensesBest Frames for Your Face ShapeHow to Measure Your PDHow to Read Your Glasses PrescriptionHow to Order Glasses OnlineHow to Wear Your EyeglassesHow to Clean Your EyeglassesMore FAQsHow to Measure Your PD

How to Measure Your Pupillary Distance(PD)?

PD(or pupillary distance) is the distance between your pupils in millimeter. Your PD is very important for accurately fitting your lenses to achieve vision acurity. In general, this number will be provided on your prescription after the eye exam; if not, you can also get it measured at home. All you need is a friend or a mirror and a ruler.

Printable PD ruler

Print this page on A4 (without scaling, at 100%. ) Use PD ruler at the bottom of the page.

Recommend to use a physical PD ruler or consult your ophthalmologist.

Download vooglam’s PD ruler

Note: Please Printed on A4.

• Measure it with a friend’s help

• Step 1 : Stand with a friend facing you, look straight ahead and place the Vooglam ruler on the bridge of your nose.

  

  Step 2 : Close your left eye and let your friend align the 0 mm over the center of your right pupil.

  

  Step 3 : Close your right eye and open the left, then let your friend note the reading directly over your left pupil. That will be your PD.

  

  Step 4 : For measuring a PD with high accuracy, please do it 3 times and take an average number of them as the final PD measurement.

  
• Measure it by a mirror
• 

• Notes:
• 1. The average PD is between 54mm and 78mm.
• 2. For those requiring progressive lenses, we strongly recommend you get this information from your optician to ensure the accuracy of your glasses.
• 3. Your PD may be written in three ways: ▪ PD (OU), written as "64", means the Binocular PD which is for both eyes. ▪ PD (OD), means the Monocular PD for the right eye, PD (OS), means the Monocular PD for the left eye. A Monocular OD is written as two numbers, for example "32/30", "32" represents the PD for the right eye, and "30" for the left eye. ▪ Sometimes PD is written as "62/59" or they are labeled "Far" and "Near". Your PD is usually measured for distance vision, which is "Far PD", or "62" in this example. For reading glasses, doctors measure your "Near PD" or "59" in the example.
• Always enter your "Far PD" for distance vision eyeglasses and enter your "Near PD" for your reading glasses only. For most people, the difference between Far PD and Near PD is about 2-3mm.

FAQ

What is a normal pupillary distance?

Normal PD for adults ranges from 54mm to 78mm. Most people measure between 60-68mm. Women average around 62mm, men around 64mm. Your PD is unique to you—what matters is measuring it accurately.

Where is my PD on my prescription?

Look for "PD" or "pupillary distance" on your prescription, usually separate from the main prescription grid. Not all prescriptions include PD. If yours doesn't, contact your eye doctor or measure it at home.

Does pupillary distance change?

For adults, PD stays stable after late teens/early twenties. It can change slightly with aging, significant weight changes, or facial injuries. Children's PD increases as they grow, so remeasure each time you order glasses for kids.

How important is pupillary distance?

Very important. Accurate PD aligns lenses with your pupils for clear vision and comfort. Incorrect PD causes headaches, eye strain, dizziness, and blurred vision—especially with stronger prescriptions or progressive lenses.

What if my PD is off by 1-2mm?

For low prescriptions (under ±2.00), you may not notice much difference. For stronger prescriptions or progressives, even 1mm can cause discomfort. When in doubt, remeasure or consult your eye doctor.

I got different measurements each time. Which to use?

Take 3-5 measurements and calculate the average. Minor variations (1-2mm) are normal. Discard measurements that differ by more than 3mm. If results vary widely, use the friend method or ask an optician.

What is dual pupillary distance?

Dual PD measures each eye separately from your nose bridge (e.g., "32/30" or "R:32mm, L:30mm"). Add them together for total PD (62mm in this example). Dual PD is more precise for progressive lenses and high prescriptions.

Should I wear glasses when measuring?

No, always remove glasses. They obstruct your view and lens distortion affects accuracy. If you need help seeing, use the friend method.

Can I use my phone to measure PD?

Yes, many apps and online tools use your camera to measure PD. While convenient, accuracy varies. Measure with multiple methods and compare results for best accuracy.

Is PD different for reading glasses?

Reading PD is typically 2-4mm smaller than distance PD because eyes converge when focusing close-up. Most people use distance PD for both without issues. Progressive lenses always use distance PD.

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