Pupillary Distance (PD) is the measurement between the centers of your pupils, typically in millimeters. It ensures that your lenses are aligned correctly with your eyes—a crucial detail for clear, comfortable vision.
Some common symptoms of incorrect PD alignment include eye strain, headaches, dizziness, and a feeling of visual discomfort.
An incorrect PD can cause your lenses to misalign with your pupils, leading to visual discomfort such as eye strain, headaches, dizziness, blurriness, or a "crossed-eye" sensation.
👁️ How to Get Your PD:
Check your prescription: Your eye doctor may have already included your PD from your last exam.
Use our PD measuring tool: If you don’t have it, no problem! During checkout, you’ll find an easy-to-use PD tool on the prescription entry page. It only takes a minute and gives accurate results using your device’s camera.
You can use the steps below to measure your PD as the tool can sometimes provide different results based on situations such as different lighting, positioning of the frame and so on"
Stand 8 inches 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.
💡 A correct PD helps make sure your lenses perform exactly as they should—especially for higher prescriptions.
Generally, PD discrepancies of 1–3 mm are acceptable and unlikely to cause noticeable issues. However, larger differences, such as 5 mm or more, may result in discomfort and require attention.