How to measure interpupillary distance?

The interpupillary distance (PD) is the space between the centres of your two pupils . In optometry, it is necessary to know it in order to locate the optical centre of each of the lenses. PD ensures that you will be able to see without distortion through your prescription glasses.

Knowing your interpupillary distance will allow you to buy your prescription glasses online and have them perfectly fit your vision. PD is usually specified in the prescription provided by the ophthalmologist. But if you don't know what your PD is, don't worry. Finding out is very simple, just follow the steps below .

Measure your pupillary distance (PD)

The pupillary or interpupillary distance is a necessary measurement to help us correctly center the customized lenses in the frame. You have several options to calculate your pupillary distance, in case you do not know this measurement.

Measuring pupillary distance with a credit or debit card

• Prepare a well-lit area.
• Take off your glasses if you are wearing them.
• Stand in the center of the screen area of ​​your mobile phone or computer.
• Place and adjust a card under your nose.
• Look directly into the camera and take the photo.

Observations:

• Make sure the card is touching your face, with the band facing out.
• Adjust the image with the help of another person if necessary.

Measuring pupillary distance with a predefined ruler

• Use a ruler or print the ruler below.
• Check that the scale is in millimeters.
• Place the ruler on your nose.
• Read the distance and write it down.

Observations:

• Check with another ruler that the distance between the numbers is actually 5 mm (there are printers that may not respect the scale).
• Use a slightly thick paper to make the ruler more stable.
• If you decide to do it alone, stand in front of a mirror and note the distance between your eyes.
• Right (R) and left (L) denote the view one has of one's eyes in the mirror.

RULE FOR CALCULATING INTERPUPILARY DISTANCE