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Why do I need to hand in two PDs when I was ordering bifocal eyeglasses online last week? I have been puzzled by this question for several days as there is only one PD on my Rx, and I never need to give two PDs when I buy prescription eyeglasses in the past few years, what are near PD and far PD? Nobody can give me a conclusive answer. Do that means everyone have these two PDs?
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