Intraocular Lens Calculations After Corneal Refractive Surgery

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As of 2007, more than 8 million people in the United States of America had undergone corneal refractive surgery (Market Scope, LLC, St. Louis, MO). As this population ages, many of these patients will require cataract surgery. “Refractive surprises” after cataract surgery have historically been a problem in postrefractive patients.1 The main reason for this problem is that refractive surgery modifies the shape of the cornea, and these changes alter the accuracy of keratometry measurements used to perform intraocular lens (IOL) calculations for cataract surgery. This review will discuss the limitations of conventional keratometry techniques and potential benefit to newer corneal topography technology for improving IOL calculations in postrefractive patients.
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