July 2018
Volume 59, Issue 9
Open Access
ARVO Annual Meeting Abstract  |   July 2018
Agreement between keratometry measurements obtained with full gradient topography and Scheimpflug tomography systems in pre- and postoperative LASIK eyes
Author Affiliations & Notes
  • Janice Tarrant
    Abbott Medical Optics, Martinez, California, United States
  • Sanjeev Kasthurirangan
    Abbott Medical Optics, Martinez, California, United States
  • Footnotes
    Commercial Relationships   Janice Tarrant, Abbott Medical Optics (E); Sanjeev Kasthurirangan, Abbott Medical Optics (E)
  • Footnotes
    Support  None
Investigative Ophthalmology & Visual Science July 2018, Vol.59, 5725. doi:
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    • Get Citation

      Janice Tarrant, Sanjeev Kasthurirangan; Agreement between keratometry measurements obtained with full gradient topography and Scheimpflug tomography systems in pre- and postoperative LASIK eyes. Invest. Ophthalmol. Vis. Sci. 2018;59(9):5725.

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      © ARVO (1962-2015); The Authors (2016-present)

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Abstract

Purpose : To assess the agreement between keratometry measurements taken with a full gradient corneal topographer and a Scheimpflug corneal tomographer in eyes before and after LASIK surgery.

Methods : A retrospective analysis was performed of pre- and postoperative keratometry data from 24 eyes of 24 subjects who underwent LASIK correction of myopic refractive errors. The mean age of the subjects was 31.5 ± 7.6 years (range: 23 to 55 years) with slightly more females (58.3%) than males. Outcome measures comprised steep (Ks) and flat (Kf) keratometry, steep keratometry axis, mean keratometry (Km), corneal astigmatism (Ca) and the J0 and J45 astigmatic components. Paired t-tests and Bland-Altman plots with 95% limits of agreement were used to evaluate the difference between measurements.

Results : The differences between the devices in all outcome measures were small and not clinically significant. For topography and tomography respectively, preoperative Km values were 43.96 ± 1.55 D and 43.76 ± 1.40 D (p = 0.07) and postoperative Km values were 40.20 ± 1.57 D and 39.80 ± 1.80 D (p = 0.01). For topography and tomography respectively, preoperative Ca values were 2.11 ± 1.38 D and 2.18 ± 1.60 D (p = 0.66) and postoperative Ca values were 0.95 ± 0.34 D and 0.83 ± 0.29 D (p = 0.09). J0 values were 0.99 ± 0.63 D and 0.92 ± 0.69 D (p = 0.28) preoperatively and 0.43 ± 0.20 D and 0.37 ± 0.17 D (p = 0.09) postoperatively for topography and tomography respectively. J45 values were 0.05 ± 0.41 D and 0.15 ± 0.50 D (p = 0.12) preoperatively and -0.02 ± 0.18 D and- 0.02 ± 0.18 D (p = 1.0) postoperatively for topography and tomography respectively. The 95% limits of agreement were slightly smaller for preoperative compared to postoperative measurements.

Conclusions : The full gradient topographer and Scheimpflug tomographer produced comparable keratometry measurements in pre- and post-refractive surgery eyes.

This is an abstract that was submitted for the 2018 ARVO Annual Meeting, held in Honolulu, Hawaii, April 29 - May 3, 2018.

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