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.
1. Please take off your glasses
If you are wearing glasses, please take it off first.
Ensure you're in a well-lit environment for enhanced accuracy.
2. Adjust your screen and look directly at the camera
Please look directly at the camera.
Please place your face in the center of the screen.
3. Please place credit card under your nose and snap a pic