Pupillary Distance (PD) is the distance, in millimeters, between the center of one pupil to the center of the other. The PD is needed to manufacture your eyeglasses because it determines the exact optical center of the lens, which is the point where you look through the lens. 💎Note: the average PD is between 54 and 78mm. | Zeelool

Your PD, or pupillary distance, is the measurement between the centre of your pupils. It’s measured in mm and very important if you have a strong prescription or are ordering varifocal lenses, so that the optical centre of the lenses can match the wearer's PD for best vision.⁣ In this episode of our "Ask the Optician" series, David Hutchfield, Head of Professional Services and Qualified Optician, explains how we obtain your PD from selfies and what's the best way for you to send them. bit.ly/3q4