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: This is the distance between your pupils in millimeters. It is critical for aligning the lens center with your vision. If it's not on your prescription, you can measure it using a ruler or tools like the Zenni Optical PD tool .

: Most prescriptions are valid for one to two years. If yours has expired, you may be able to use a 10-minute virtual vision test offered by retailers like Warby Parker for a small fee. buy power glasses online

Virtual Try-On | Sunglasses & glasses online | SmartBuyGlasses US : This is the distance between your pupils in millimeters

: Match the width, bridge size, and temple length of a current pair of well-fitting glasses. Step-by-Step Purchase Guide buy power glasses online