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.

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.

Millimeter Ruler

Mirror

Follow the below step to measure your PD.

- Stand 8 inches away from the mirror facing your Mirror.

- With your face straight, hold the ruler against your brow.

- Close your right eye and align the ruler zero to center of your left pupil.

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.