What Is Pupillary Distance?
Pupillary Distance (PD) is the measurement from the center of one pupil to the center of the other.
Why Is It Important?
Every set of prescription lenses has an “optical center,” which is determined by pupillary distance. Pupillary distance is used to determine where you look through the lens of your glasses and should be as accurate as possible.
Measure The Distance
Your prescription may tell you your PD. But if the PD is not available, use your friend or a mirror to help you figure it out.
MEASURING YOUR OWN PD
HAVING A FRIEND MEASURE YOUR PD
If a friend is measuring your PD, keep both eyes open and have your friend put the zero on the millimeter ruler over the center of one pupil, then measure the distance to the center of the other pupil.
TIPS WHEN A FRIEND IS MEASURING:
• Have them crouch/sit while you stand so they are out of your field of vision.
• Keep your eyes as still as possible.
• Look above his/her head at something approximately 10-20 ft. away.
• Do not look at the person measuring!
With your PD in one hand and your prescription in another, you can save time and money by handling all of your optical needs at Zinff.