Your PD may be written in three ways:

PD (OU), written as "64", means the Binocular PD which is for both eyes.

PD (OD), means the Monocular PD for the right eye, PD (OS), means the Monocular PD for the left eye.

A Monocular OD is written as two numbers, for example, "32/30", "32" represents the PD for the right eye, and "30" for the left eye.

Sometimes PD is written as "62/59" or they are labeled "Far" and "Near". Your PD is usually measured for distance vision, which is 'Far PD", or "62" in this example. For reading glasses, doctors measure your "Near PD" or "59" in the example.

Always enter your "Far PD" for distance vision eyeglasses and enter your 'Near PD" for your reading glasses only. For most people, the difference between Far PD and Near PD is about 2-3mm.