Your pupillary distance (PD) is the millimeter distance between your pupils.
We need this information so we know where to put the optical center on each lens, so you’ll have the truest vision. If it’s incorrect, it can throw off your vision — making it hard to focus properly and potentially causing headaches or nausea.
Your PD is often found on the prescription from your eye doctor. If you can't find your PD, you can measure it easily using our free online PD reader when you order lenses from us.
If you choose to do it yourself, you can find instructions and a downloadable PD ruler here:
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