Pupillary Distance

Pupillary Distance (PD) is the distance (in millimeters) between the centers of the pupils in each eye. This specific way of measuring is employe when getting ready to create prescription eyeglasses. Placing lenses accurately in relative to the centre of the pupils is mainly crucial for higher power lenses due to the position of the optical centre of the lenses. A PD measurement makes sure that the center of the lenses line up with the…