PD stands for Pupillary Distance, which is the measurement of the distance between the centers of your pupils in millimeters. It is an important measurement used to ensure the proper alignment of your lenses with your eyes. To find your PD, you can use a millimeter ruler and a mirror. Simply hold the ruler against your brow line and measure the distance between the centers of your pupils. At FuzWeb.com, we understand that obtaining your PD measurement may not always be easy. That's why we provide a convenient PD finder tool in the area where you can manually input your eyeglass prescription values. This tool allows you to determine your PD accurately and easily, ensuring that your lenses are customized to your unique needs. For a detailed view of this please go here: How To Order Lenses