What is Pupillary Distance?

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.

How to Measure Your Pupillary Distance

What Is Pupillary Distance?

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.

If you don’t have your PD from your eye doctor, you can measure it yourself with the help of a friend.

Spexfree frame-component
Why Is It

Important?

Every set of prescription lenses has an “optical center,” which is determined by pupillary distance. Pupillary distance is used to determine where you look through the lens of your glasses and should be as accurate as possible.

Millimeter Ruler

Mirror

This is the only quide you need when you want to know your PD to buy your eyeglass or sunglass frames. If you need assistance identifying your PD, feel free to connect with our expert he/she will be more happy to help at your ease.

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MEASURING YOUR OWN PD

Follow the below step to measure your PD.

FACE MIRROR
  • Stand 8 inches away from the mirror facing your Mirror.
PLACE RULER
  • With your face straight, hold the ruler against your brow.
MEASURE PD
  • Close your right eye and align the ruler zero to center of your left pupil.
Spexfree Dual PD
What Is Single Vs Dual PD ?

Here you go...

SINGLE PD is the pupillary distance between the center of one pupil to the other, which can be a distance PD or near PD. Distance PD can be used to order any type of prescription glasses except reading glasses. Read below to learn how to calculate near PD for reading glasses.

DUAL PD, or monocular PD, consists of two numbers and is the distance between the centers of each pupil to the bridge of the nose. Dual PD is usually written in the following notation: 32/30. The first number is always the right eye (OD) measurement, and the second number is the left eye (OS).

How Do You Calculate Near PD For Reading Glasses?

You can calculate Near PD for reading glasses by subtracting 3mm from your distance PD. For example, if your distance PD is 62mm, then your near PD is 59mm.

If you are using Dual PD to calculate near PD, then subtract 1.5mm from each eye’s measurement. For example, if your dual PD is 32/30mm then your near PD would be 30.5/28.5mm.