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.
PD may vary for different prescriptions, such as distance and reading glasses. For instance, a distance PD might be 59 mm, while a reading PD could be 56 mm, reflecting the different focal points required for far and near 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 also measure your PD at home:
Stand in front of a mirror with a ruler.
Close one eye and align the 0 mm mark of the ruler with the center of your open pupil.
Close the other eye and note the distance to the center of the other pupil.
Repeat for accuracy.
💡 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.