Your Pupillary Distance (PD) is the measurement of distance between the centers of your pupils. You can ask your optometrist to provide this information for you. If you are unable to obtain this information Focus and Frame Eyewear has a step by step instructional video and printable PDF with an accompanying ruler to help you measure your PD.
Step One – Grab the things you will need: mirror, pencil and paper to capture your (PD) measurements.
Step Two - Stand approximately 8 inches away from a mirror in a heavily lighted area.
Step Three - While looking straight ahead, hold the ruler over your eyebrow.
Step Four - Close your right eye and align the ruler to 0 mm in the center of your left pupil.
Step Five - While continuing to look directly in front, close your left eye and open your right eye. The mm line that aligns directly to the center of your right pupil is your PD measurement.
Check out the video below for a step by step tutorial.