Dear customer,PD stands for Pupillary Distance, which is the distance between your pupils in millimeters. The average PD range for adults is 55-75 mm and for kids is about 42-55 mm. 32mm is the PD for your each eye, you can fill in 64mm when you place the order. Any further questions, please contact us through Live Chat or email. Thank you.
Firmoo's reply to Jay on Oct 29 , 2019