Original articleComparison of intraocular lens power calculation methods in eyes that have undergone LASIK☆
Section snippets
Patients
On obtaining institutional review board approval, we analyzed IOL power results in 11 consecutive eyes of 8 patients who had previously undergone LASIK for myopia and underwent cataract surgery at some point from July 2002 through July 2003. All cataract surgeries were performed in the same manner by the same surgeon (DDK) using a temporal clear corneal incision, phacoemulsification, and implantation of the SA60AT IOL (Alcon Surgical, Inc., Fort Worth, TX). Before surgery, the clinical history
Results
The mean age of the 8 patients was 50 years (range, 37–60 years). The amount of LASIK-induced correction (±standard deviation) was −5.50±2.61 D (range, −8.78 to −2.38 D), and the mean manifest refraction after cataract surgery was −0.61±0.79 D (range, −2.0 to 1.0 D; Table 1). The eye with the greatest amount of hyperopia was 1 of the 2 eyes for which we used the single-K Holladay 1 formula (case 7). To illustrate the spectrum of outcomes for each eye, the IOL prediction errors with Holladay 2
Discussion
The reduced accuracy of IOL calculations after corneal refractive surgery is a clinical problem of growing importance. Although published studies suggest that the clinical history method is a helpful approach for calculating corneal power, the numbers of eyes in these studies were small, and unacceptably large refractive surprises still occurred.3, 17, 18 Using the Holladay 2 formula, Randleman et al17 evaluated the accuracy of several techniques for calculating IOL power in 10 LASIK eyes. They
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Manuscript no. 240063.
Supported by an unrestricted grant from Research to Prevent Blindness, Inc., New York, New York.