Myopia Research Today is a free monthly online journal that collates and summarizes the latest research about Myopia, including details on treatment, prevention, causes, correction.

Nomogram-based intraocular lens power adjustment after myopic photorefractive keratectomy and LASIK: a new approach.

Feiz V, Moshirfar M, Mannis MJ, Reilly CD, Garcia-Ferrer F, Caspar JJ, Lim MC

Department of Ophthalmology, University of California, Davis Medical Center, Sacramento, California 95817, USA. Vfeiz@ucdavis.edu

PURPOSE: (1) To evaluate the accuracy of nomogram-based adjustment of intraocular lens (IOL) power to achieve a desired refractive target after cataract surgery in postmyopic LASIK and photorefractive keratectomy (PRK) eyes and (2) to compare the accuracy of the nomogram-based method with the clinical history method. DESIGN: Multicenter, retrospective, interventional, noncomparative case series. SUBJECTS: Fourteen patients (19 eyes) after myopic LASIK or PRK with visually significant cataracts. INTERVENTION: All eyes underwent cataract extraction and posterior chamber intraocular lens implantation. In each case, IOL power was determined with standard keratometry and biometry. Power adjustment was made by use of a theoretical nomogram followed by implantation. MAIN OUTCOME MEASURES: (1) Final refraction and spherical equivalent after cataract surgery and (2) deviation of the final spherical equivalent from the refractive target. RESULTS: After cataract extraction, by use of nomogram adjustment, 63.2% of eyes were within 0.5 D of the intended spherical equivalent, 84.2% were within 1.0 diopter of the intended spherical equivalent, and 100% were within 1.5 D of the intended spherical equivalent. The clinical history method was accurate in predicting the correct IOL power in 37.5% of cases, regardless of whether spectacle or corneal plane refraction was used. CONCLUSIONS: (1) Given the change in spherical equivalent induced by myopic LASIK/PRK, IOL power can be adjusted accurately to avoid undercorrection without the need for the prerefractive surgery corneal power. (2) The nomogram-based method was more accurate than the clinical history method.

Published 2 August 2005 in Ophthalmology, 112(8): 1381-7.
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