What is Pupillary Distance?

What is PD? Why is it important?

PD (Pupillary Distance) is the distance between the centers of your pupils, measured in millimeters. It’s an essential measurement for making sure your eyeglass lenses are properly aligned with your eyes.

Here's why it's important:

  • Lens Alignment: PD ensures that the optical center of each lens sits directly in front of your pupils. If the PD is incorrect, the lenses won’t align properly, which can cause eye strain, headaches, or blurry vision.
  • Clear Vision: Accurate PD helps your lenses focus light correctly for clear and comfortable vision, especially for prescription glasses, progressive lenses, or reading glasses.

If you're unsure of your PD, you can ask your optician to measure it, or you can measure it yourself at home using the ruler we provide and a mirror. Proper PD measurement is crucial for optimal vision and comfort!

Back to blog