What is a Pupillary Distance (PD) and why do I need it?Updated 2 months ago

Pupillary Distance (PD) is the measurement in millimeters between the center of your right pupil and the center of your left pupil. It is used to position the optical center of each lens directly in front of your pupils, ensuring accurate vision correction and comfort. TrueDark Rx requires a monocular PD (each eye measured separately from the nose bridge), with a minimum of 28mm per eye. Your PD is often listed on your eyeglass prescription. If it’s not included, your eye doctor can provide it, or you can measure it at home using a PD ruler and a mirror.