June 2017
Volume 58, Issue 8
Open Access
ARVO Annual Meeting Abstract  |   June 2017
Comparison of keratometry measurements using the iDesign® Advanced WaveScan Studio System, manual and auto-keratometers
Author Affiliations & Notes
  • Janice Tarrant
    Abbott Medical Optics, Martinez, California, United States
  • Ying wang
    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); Ying wang, Abbott Medical Optics (E); Sanjeev Kasthurirangan, Abbott Medical Optics (E)
  • Footnotes
    Support  None
Investigative Ophthalmology & Visual Science June 2017, Vol.58, 3540. doi:
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    • Get Citation

      Janice Tarrant, Ying wang, Sanjeev Kasthurirangan; Comparison of keratometry measurements using the iDesign® Advanced WaveScan Studio System, manual and auto-keratometers. Invest. Ophthalmol. Vis. Sci. 2017;58(8):3540.

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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, the iDesign® Advanced WaveScan Studio™ (AWS) System, and manual and auto-keratometers.

Methods : A retrospective analysis was performed of pre-operative keratometry data from 167 right eyes of 170 subjects who underwent LASIK correction of myopic refractive errors. The mean age of the subjects was 32.3 ± 8.3 years (range: 18 to 58 years) with slightly more males (54.7%) than females. Outcome measures comprised steep (Ks) and flat (Kf) keratometry, steep keratometry axis, mean keratometry (Km), corneal astigmatism (Ca) and the J0 and J45 components. Measurements were made on 60 eyes with manual keratometry, 107 eyes with auto-keratometry and on all eyes with iDesign® System topography. 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. Pre-operative iDesign® Km ranged from 40.675 to 47.735 D. Km values were 44.13 ± 1.30 D and 44.24 ± 1.33 D for manual and iDesign® devices respectively (p = 0.05, n = 60) and 44.14 ± 1.49 D and 44.22 ± 1.41 D for auto and iDesign® devices respectively (p = 0.04, n = 107). Ca values were 1.71 ± 1.31 D and 1.74 ± 1.27 D for manual and iDesign® devices respectively (p = 0.37) and 1.59 ± 1.31 D and 1.65 ± 1.35 D for auto and iDesign® devices respectively (p = 0.005). For manual and iDesign® devices, J0 values were 0.74 ± 0.72 D and 0.77 ± 0.69 D respectively (p = 0.28) and 0.65 ± 0.72 D and 0.67 ± 0.74 D for auto and iDesign® devices respectively (p = 0.02). For manual and iDesign® devices, J45 values were 0.02 ± 0.30 D and 0.02 ± 0.31 D respectively (p = 0.91) and -0.02 ± 0.34 D and 0.02 ± 0.37 D for auto and iDesign® devices respectively (p = 0.002). The 95% limits of agreement were similar for the paired device analyses and slightly smaller between the auto-keratometer and iDesign® topographer.

Conclusions : The iDesign® AWS System produced comparable keratometry measurements to manual and auto-keratometers in pre-refractive surgery eyes.

©2016 Abbott Medical Optics Inc. iDESIGN and iDESIGN ADVANCED WAVESCAN STUDIO are trademarks owned by or licensed to Abbott Laboratories, its subsidiaries or affiliates.

This is an abstract that was submitted for the 2017 ARVO Annual Meeting, held in Baltimore, MD, May 7-11, 2017.

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