: You must have a current eye exam from an optometrist. Online stores will require details like Sphere (SPH) , Cylinder (CYL) , and Axis to read your prescription accurately .
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: Ensure the store offers at least a 14-day "no questions asked" return or exchange policy in case the fit isn't right. : You must have a current eye exam from an optometrist
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: Prices are often 50–70% lower than physical stores.