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What is PD? Why do I have 2 PD's?
What is PD? Why do I have 2 PD's?
PD refers to your Pupillary Distance. This is the measured distance between the optical centre of your right and left eye. This measurement is used in relation to frame dimensions to ensure your lenses are positioned where they should be for optimal visual acuity and comfort. You may have two values for your PD, one for near applications and one for distance application.