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How to measure your pupillary distance (PD)
Single PD-Single PD measures the distance between the centers of your pupils. It can be a distance PD (for most glasses) or a near PD (for reading glasses). Use distance PD for all prescription glasses except reading glasses.

Single PD

Single PD measures the distance between the centers of your pupils. It can be a distance PD (for most glasses) or a near PD (for reading glasses). Use distance PD for all prescription glasses except reading glasses.
Dual PD-Dual PD (or monocular PD) includes two measurements: from each pupil to the bridge of your nose. It's written as 32/30, where the first number is for the right eye (OD), and the second for the left eye (OS).

Dual PD

Dual PD (or monocular PD) includes two measurements: from each pupil to the bridge of your nose. It's written as 32/30, where the first number is for the right eye (OD), and the second for the left eye (OS).

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