PresbyLite II software computes the correct parameters after you fill in the K's, RX and add power.
The Presbylite II™ bifocal is a translating design that has a SPHERICAL base curve so the design is fit like any spherical gas permeable lens. The fluorescein pattern should show an alignment fit. Corneas with more than 3 diopters of corneal cylinder are counter-indicated.
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