How to Measure Your Pupillary Distance (PD)
Pupillary distance (PD) measures the distance between the centers of your pupils. This measurement is used to determine where you look through the lens of your glasses and should be as accurate as possible. The average adult’s PD is between 54-74 mm; kids' are between 43-58 mm. Your eye doctor will usually measure your PD during an eye exam. However, if it was not given to you, the below 5 steps will help you measure it yourself.
- Stand 8 in. away from a mirror.
- Hold a ruler against your brow.
- Close your right eye then align the ruler’s 0 mm with the center of your left pupil.
- Look straight then close your left eye and open your right eye.
- The mm line that lines up to the center of your right pupil is your PD.
Check out the graphic below to learn how your friend can help you measure your PD.
Armed with your PD and prescription, you can shop at Zenni to find your perfect pair of glasses.
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How to Measure Your Pupillary Distance
The average adult’s PD is between 54-74 mm; kids' are between 43-58 mm.
Why Is It Important?
Measure the Distance
MEASURING YOUR OWN PD
Stand 8 in. away from the mirror.
With your face straight, hold the ruler against your brow.
Close your right eye and align the ruler’s zero to the center of your left pupil.
While looking straight, close your left eye and open your right eye.
Read the mm line that lines up with the center of your right pupil. This number is your PD.
A Few Things to Note
- Measure your PD 3-4 times to ensure it's accurate and consistent.
- Range of Adult PD: 54-74 mm
- Range of Child PD: 43-54 mm
- Have them crouch/sit while you stand so they are out of your field of vision.
- Keep your eyes as still as possible.
- Look above his/her head at something approximately 10-20 ft. away.
- Do not look at the person measuring!
With your PD in one hand and your prescription in another, you can save time and money by handling all of your optical needs at Zenni.