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Ensure your prescription includes an "ADD" or "NV" (Near Vision) power. This is the magnification needed for the lower reading section of your bifocals, typically ranging from +1.00positive 1.00 +3.50positive 3.50 Validity: Most prescriptions are valid for 1–2 years. 2. Measure Your Pupillary Distance (PD) buy bifocal glasses online
The PD is the distance between the centers of your pupils in millimeters. This measurement ensures the optical centers of your lenses align perfectly with your eyes. Bifocal Glasses Lenses | What Are Bifocals? - Glasses2You Your Guide to Buying Bifocal Glasses Online Buying