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: This is the distance (in millimeters) between your pupils. It ensures the optical center of the lens aligns perfectly with your eyes. If it’s not on your prescription, you can measure it yourself using a ruler or tools from sites like Kits.com .

Before you start browsing retailers like Warby Parker or GlassesUSA, gather these three critical pieces of information: buy glasses lenses online

Select a lens based on your vision needs and daily activities: How to Order Prescription Glasses Online LIKE A PRO : This is the distance (in millimeters) between your pupils

: Ensure your prescription is current, typically issued within the last 1–2 years . It should include values for Sphere (SPH) , Cylinder (CYL) , and Axis . and Axis .