What is Pupillary Distance?

PD:

One-number PD:

Two-number PD:

How to Measure Your PD?

Step 1:

Stand approximately 8 inches (20cm) away from a mirror.

Step 2:

With your face straight, hold a ruler against your eye. Please measure your PD 3 times to get accurate results.

Step 3:

Step 4:

Step 5:

How to 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 63mm, then your near PD is 60mm. 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 33/31mm then your near PD would be 31.5/29.5mm.