How to Measure Your Pupillary Distance (PD)？

The PD is a crucial number when purchasing prescription glasses. PD or Pupillary distance refers to the distance between the center of each pupil and helps correctly position the lenses to ensure proper vision. The PD number is sometimes included in your prescription but may often be omitted by your eye care professional.

You can measure your PD by yourself or with the help of a friend.

While holding a ruler with the mm side facing up, place one end directly below the center of your eye. Align the ruler horizontally to the center of the opposing eye and measure the distance between the two eyes. It is important that you are looking straight forward when measuring for the most accurate number.