Pupillary Distance (PD) is the distance, in millimeters, between the center of one pupil to the center of the other. The PD is needed to manufacture your eyeglasses because it determines the exact optical center of the lens, which is the point where you look through the lens. PD is especially important for manufacturing progressive lenses.
Grab the things you will need: mirror, pencil and paper to capture your (PD) measurements.
Stand approximately 8 inches away from a mirror in a heavily lighted area.
While looking straight ahead, hold the ruler over your eyebrow.
Close your right eye and align the ruler to 0 mm in the center of your left pupil.
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.
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