The term single PD refers to the pupillary distance between the center of one pupil to the other. This can be measured as a distance or near PD. The distance PD is used for prescription glasses, with the exception of reading glasses.

Do I need a different PD for reading glasses?

Your PD automatically adjusts during the day, as your eyes move between different viewing distances. Fortunately, when ordering glasses including progressive designs, only the distance PD is necessary as standard adjustments are made to accommodate for reading or computer vision.

What is the PD for reading glasses?

PD – Pupillary distance

Over-the-counter readers are made with an average PD of 60-63mm, but not everyone’s measurement falls within these parameters. Reading from glasses with an incorrect PD can affect vision quality, leading to headaches, double vision and eyestrain.

Does PD affect frame size? Your PD has no effect on the size of your eyeglass frame. The PD number influences the shape of your lenses, but not the frame.