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his wife has two PDs for her bifocal eyeglasses prescription his wife has two PDs for her bifocal eyeglasses prescription
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Old 11-10-2010, 06:52 AM
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Default his wife has two PDs for her bifocal eyeglasses prescription
For bifocal eyeglasses, prescription should have two PD values, one is distance PD and the other is near PD for reading area. And the near PD is calculated as 2-3mm less than the distance PD. If the two numbers are vary considerably, please contact a professional store to obtain the exact value. Attention!
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