What is Pupillary Distance?
Pupillary distance (PD) is the measurement in millimetres of the space between the pupils of your eyes. This measurement is important as it is used to place the optical center of your lens in your frames properly.
The average adult’s PD is between 54-74; kids' are between 43-54.
Your PD should always be measured and not estimated. At a minimum the wrong PD can feel like something is wrong with your glasses, but it can also induce eye strain, fatigue, headaches and blurry vision.
If you have a high prescription and the wrong PD these symptoms can often be much worse.
If you are ordering a BiFocal or Progressive lens, it can greatly affect how you see through your lenses
How to Measure Your PD?
- Stand 8 in. away from a mirror.
- Hold a ruler against your brow.
- Close your right eye then align the ruler’s 0 mm with the center of your left pupil.
- Look straight then close your left eye and open your right eye.
- The mm line that lines up to the center of your right pupil is your PD.
Check out the graphic below for more information and to learn how your friend can help you measure your PD.
Armed with your PD and prescription, you can shop at Zenni to find your perfect pair of glasses.
To Download the PD Ruler, click here.