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Before you begin, ensure you have the following information ready:

: 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

: 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 . Before you begin, ensure you have the following