How to measure your Pupillary Distance (PD) 1


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.

Click here for your printable PD Ruler and step by step guide!


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.

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