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Calculating Intraocular Lens Power After Refractive Corneal Surgery
Arch Ophthalmol. 2002;120:500-501.
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IT IS ESTIMATED that a million or more patients undergo corneal refractive
surgery each year. Because the majority of these patients have myopia, and
patients with myopia develop cataracts at a much earlier age than patients
with emmetropia or hyperopia,1-2
intraocular lens (IOL) power calculation for these eyes will become increasingly
problematic for all cataract surgeons.
Corneal refractive surgery changes the architecture of the central cornea
such that standard methods of measurement overestimate the corneal power.
Radial keratotomy (RK) causes a relatively proportional flattening of both
the front and back surfaces of the central cornea, which leaves the index
of refraction relationship the same. On the other hand, PRK (photorefractive
keratectomy) and LASIK (laser-assisted in situ keratomileusis) flatten only
the front surface. This changes the refractive index calculation and creates
an additional overestimation of the corneal power by about 1 diopter (D) for
every 7 D of refractive surgery correction . . . [Full Text of this Article] PRESENT METHODS
Clinical History Method Contact Lens Method
RESULTS
THE FUTURE
Corresponding author and reprints: Kenneth J. Hoffer, MD, St Mary's
Eye Center, 1441 Broadway, Santa Monica, CA 90404 (e-mail: khoffermd@aol.com).
RELATED ARTICLE
Clinical and Theoretical Results of Intraocular Lens Power Calculation for Cataract Surgery After Photorefractive Keratectomy for Myopia
Monica T. P. Odenthal, Cathrien A. Eggink, Gerrit Melles, Jan H. Pameyer, Annette J. M. Geerards, and W. Houdijn Beekhuis
Arch Ophthalmol. 2002;120(4):431-438.
ABSTRACT
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