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    Refractive Mgmt/Intervention

    Bicentric grinding (slab-off). A, Lens form with a dummy lens cemented to the front surface. B, Both surfaces of the lens are reground with the same curvatures but removing base-up prism from the top segment of the front surface and removing basedown prism from the entire rear surface. C, The effect is a lens from which base-down prism has been removed from the lower segment only.