May 2005
Volume 46, Issue 13
Free
ARVO Annual Meeting Abstract  |   May 2005
Validation of Corneal Power Following LASIK Using Tomey Topographic Modeling System (TMS) in Pseudophakic Patients
Author Affiliations & Notes
  • P. Kelley
    Ophthalmology, UT Southwestern, Dallas, Dallas, TX
  • Footnotes
    Commercial Relationships  P. Kelley, None.
  • Footnotes
    Support  None.
Investigative Ophthalmology & Visual Science May 2005, Vol.46, 856. doi:
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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)

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Abstract

Abstract: : 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.

Keywords: refractive surgery: corneal topography • refractive surgery: corneal topography 
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