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: This is the distance (in millimeters) between the centers of your pupils. It ensures the optical center of the lenses aligns with your eyes.

Tip : If it’s not on your prescription, you can measure it yourself using a millimeter ruler and a mirror. Top Online Retailers in 2026 buy glasses online usa

Before you begin shopping, you must have two key pieces of information: : This is the distance (in millimeters) between