Measure your pupillary distance (PD) with a credit card

PD is the distance between your pupils, and it's used to help center a prescription correctly in your frames.

Credit cards have a globally standardized width of 85.60 mm and a height of 53.98 mm. Your interpupillary distance is calculated by detecting the size of the credit card in the image.

The effective error of interpupillary distance is 2mm.

Our measurement results include both single-PD and dual-PD.

Please read the following steps before using our interpupillary distance measurement tool.

1. Please take off your glasses
  • If you are wearing glasses, please take it off first.
  • Please ensure you are in a well-lit environment with a clean background.
2. Place a credit card above your eyebrows.
  • Any card the same size as a credit card will work.
  • Hold the credit card firmly against your forehead.
  • Keep the credit card parallel to your forehead.
3. Face the camera straight on and capture a photo of your face.
  • Adjust the camera angle so you're looking directly into it, ensuring clear visibility of your pupils.
  • Please take multiple measurements and calculate the average.
Start Measurement