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: The measurement between your pupils in millimeters. While you can measure PD yourself with a ruler, an professional measurement is highly recommended for trifocals.

: This is critical for lined trifocals. It determines exactly where the intermediate and near vision sections start in the lens. If this is off, you may experience significant visual distortion. Steps to Buy Trifocals Online Lined Trifocal Glasses - Rx Prescription Safety Glasses buy trifocals online

To order successfully, you must have the following data from your eye doctor: : The measurement between your pupils in millimeters

: Must be unexpired (usually within 1–2 years) and include ADDcap A cap D cap D values for both intermediate and near vision. buy trifocals online