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P. Kelley; Validation of Corneal Power Following LASIK Using Tomey Topographic Modeling System (TMS) in Pseudophakic Patients . Invest. Ophthalmol. Vis. Sci. 2005;46(13):856.
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© ARVO (1962-2015); The Authors (2016-present)
Purpose: To assess the validity of the keratometric ring values on the Tomey Topographic Modeling System (TMS) as a predictor of corneal power in post–LASIK patients when preoperative keratometric values are not available. Methods: Data was retrospectively collected on 9 eyes of 6 patients who underwent cataract surgery and had a previous history of LASIK surgery in the same eye. Data collected included pre and post LASIK automated keratometry, post–LASIK refraction at 3–6 months, TMS data prior to cataract surgery, power of the intraocular lens (IOL) implanted, and spherical equivalence (SE) at 1 month after cataract surgery. The post–LASIK K value was "back–calculated" from the IOL and postoperative SE using the double–K SRK/T formula. The historical K method was also used to predict the post–LASIK K value. Results: The mean "back–calculated" post LASIK K value was 39.42 +/– 5.31 D, the historical K value was 39.54 +/– 5.80 D. The mean K value of the first, second, third, fourth, and fifth ring on the TMS were 40.06 +/– 6.2 D, 39.64 +/– 5.77 D, 39.71 +/– 5.47, 39.92 +/– 5.22 D , and 39.98 +/– 5.14 D. The third ring correlated the most with the back–calculated K as well as with historical K (Rsqu=0.998, p=0.24), followed by the second ring (Rsqu=0.98). Conclusions: The TMS is a useful tool to predict post LASIK corneal power based on the third ring value, whenever the historical method cannot be used.
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