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Old 02-04-2010, 10:16 AM
Junior Member
 
Join Date: Jan 2010
Posts: 28
Default How do you know about near and far PD?

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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