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A. Gant, A. Ratanasit, D. Bogorad, B. Ambati; Correlation between change in keratometry and refractive ablation in LASIK patients . Invest. Ophthalmol. Vis. Sci. 2004;45(13):209.
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Abstract: : Purpose: To determine the relationship between the attempted refractive ablation and the change in keratometry for eyes undergoing laser in situ keratomileusis (LASIK) using the flying spot laser. Methods: A retrospective chart review of 41 eyes of 21 patients undergoing LASIK at the Medical College of Georgia from September 2002 through August 2003. Only eyes with a planned post–operative spherical equivalent of plano were used. The Zeiss Humphrey Systems Automated Topographer was used for keratometry measurements. Results: Laser in situ keratomileusis was performed on 41 eyes of 21 patients with a mean age of 40.1 years old (range 20 to 61 years old) using the Alcon Ladarvision 4000. Thirty–nine eyes had a pre–operative myopic spherical equivalent with an average of –4.90 D (range –9.50 to –1.75 D and standard deviation 2.05). The 2 hyperopic eyes had an average spherical equivalent of 1.69 D (1.625 and 1.750 D with standard deviation of 0.09). The average pre–operative keratometry was 44.85 D (range 43.00 to 47.25 D). The average change in keratometry was 3.13 D (range –7.38 to 2.19 D), and the change in keratometry per diopter sphere refractive ablation was 0.63 with a standard deviation of 0.20. Conclusions: The coupling relationship between the change in keratometry and the attempted refractive ablation for the flying spot laser was found to be 0.63 with a standard deviation of 0.20.
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