Simplified formulas for lathing aphakic epikeratophakia lenses.

Geometrically based formulas for lathing aphakic epikeratophakia lenses have been simplified to enable easy calculation of the radii of cut for the optical and the wing zones. The formulas compensate for postoperative thinning of the lens on host cornea and allow for any desired amount of pre-lathing dehydration. Clinical results to date show that over 80% of lenses are made within 3 diopters of the expected power.