Pupillary Distance (PD)
PD refers to the distance in millimeters (mm) between the centers of the pupils in the eyes.This measurement helps manufacturers prepare prescription glasses, as it ensures that the prescription aligns with the person’s eyes. PD indicates exactly where the individual will look through the lenses of their glasses.
There are two types of PD. Far PD refers to the distance between the pupils when a person is viewing a distant object. Eye doctors use this type of PD for distance vision glasses. Near PD is the distance between the pupils when an individual is looking at a near object, such as when reading.
inaccuracies in PD measurements can lead to:
- Distorted vision
- Blurred vision