How to Measure Your Pupillary Distance (PD)

Average adult pd: 54-74 mm | average child pd: 43-58 mm

You’ll need to know your PD if you want to order glasses from All About Eyes with an outside prescription. If your glasses prescription doesn’t include your PD, we can show you how to measure it by yourself!

What is Pupillary Distance?

Pupillary Distance (PD) is the distance in millimeters between the center of one pupil to the center of the other. This measurement is used to determine where you look through the lens of your glasses and should be as accurate as possible.

Why is Pupillary Distance Important?

The PD helps determine the “optical center” of a prescription glasses lens. The optical center is where you look through the lens of your glasses and should be extremely accurate. If your PD is incorrect, it can cause eye strain, fatigue, headaches, and blurry vision.

How To Measure Your Pupillary Distance?

You will need to measure your PD 3 to 4 times and take the average to ensure its accuracy.

This measurement process is for Single Vision and Progressive lenses. To have an accurate PD for Reading glasses, take the PD average and subtract 3.