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IOL Power (SRK Formula)

D_IOL = A – 2.5L – 0.9K. Where D_IOL = recommended power for emmetropia, A = a constant (provided by manufacturers for their lenses), L = axial length in mm, K = average keratometry reading in diopters for desired ametropia.

Change IOL power by 1.25 to 1.5D for each diopter of desired ametropia. Alternate formulas are needed for shorter or longer eyes.