Buying Glasses Online
The easiest way to find your frame sizes is to look at the frames you already own.
Most manufactures write the frame size on the inside of the temple.
For example, frame size: 45-20-140
PD – Pupillary Distance
Pupillary Distance (PD) is the distance between the centers of the pupils in each eye measured in millimeters. This measurement is used when preparing to make prescription eyeglasses. Positioning lenses correctly in relation to the center of the pupils is especially important for higher powered lenses due to the location of the optical center of the lenses.
Obtaining Your PD
1. From Your Optometrist
Before you have your eyes examined, ask your Optometrist to provide you with your PD measurement. Note, the PD measurement is technically not part of your prescription, but a measurement for the purpose of creating eyeglass lenses, so you may be charged a small fee.
Most PDs are a single value and is entered into the form as a “Distance PD”. Under certain circumstances, your Optometrist may give you two PD’s, one for each eye. This is called Monocular Distance PD and the measurement is taken from the bridge of the nose to the center of each pupil. In this case you would have a PD for the Right Eye and a PD for the Left Eye. Enter each value into the form for as indicated for “Two PDs”.
2. Measure Your PD Yourself.
How To Read Your Prescription