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Hace 1 día · Understanding Prescription Levels. Knowing your diopter strength is crucial. Diopter strength indicates the corrective power of the lenses and is commonly marked on the inner arms of the glasses. For example: Age 40-44: +0.75 to +1.00 diopter. Age 45-49: +1.00 to +1.50 diopter. Age 50-54: +1.50 to +2.00 diopter.
