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his wife has two PDs for her bifocal eyeglasses prescriptionFor 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...
what's mean for the split prism on the eyeglasses prescription?Such as: 8^BU O.D. would be split 4^BU O.D. and 4^BD O.S. But when splitting horizontal prism the lenses would be both the same base direction (both lenses...