July 2019
Volume 60, Issue 9
Free
ARVO Annual Meeting Abstract  |   July 2019
Repeatability and Reliability of a Combined Dual-Scheimpflug Placido Disc Corneal Topographer in Eyes with Keratoconus
Author Affiliations & Notes
  • Anne Poulsen
    Ophthalmology, Penn State Medical Center, Hummelstown, Pennsylvania, United States
  • Diane Jang
    Ophthalmology, Penn State Medical Center, Hummelstown, Pennsylvania, United States
  • Mahmood Khan
    Ophthalmology, Baylor College of Medicine, Texas, United States
  • Zaina Nabil Al-Mohtaseb
    Ophthalmology, Baylor College of Medicine, Texas, United States
  • Michael Chen
    Ophthalmology, Penn State Medical Center, Hummelstown, Pennsylvania, United States
  • Tara O'Rourke
    Ophthalmology, Penn State Medical Center, Hummelstown, Pennsylvania, United States
  • Donald Williams
    Ophthalmology, Penn State Medical Center, Hummelstown, Pennsylvania, United States
  • Kalins Banerjee
    Ophthalmology, Penn State Medical Center, Hummelstown, Pennsylvania, United States
  • Xiang Zhan
    Ophthalmology, Penn State Medical Center, Hummelstown, Pennsylvania, United States
  • Ingrid U Scott
    Ophthalmology, Penn State Medical Center, Hummelstown, Pennsylvania, United States
  • Seth Pantanelli
    Ophthalmology, Penn State Medical Center, Hummelstown, Pennsylvania, United States
  • Footnotes
    Commercial Relationships   Anne Poulsen, None; Diane Jang, None; Mahmood Khan, None; Zaina Al-Mohtaseb, Alcon (C), Bausch and Lomb (C), Johnson and Johnson (C); Michael Chen, None; Tara O'Rourke, None; Donald Williams, None; Kalins Banerjee, None; Xiang Zhan, None; Ingrid Scott, Thrombogenics (S); Seth Pantanelli, Carl Zeiss Meditec (C), Carl Zeiss Meditec (S)
  • Footnotes
    Support  None
Investigative Ophthalmology & Visual Science July 2019, Vol.60, 2114. doi:
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      Anne Poulsen, Diane Jang, Mahmood Khan, Zaina Nabil Al-Mohtaseb, Michael Chen, Tara O'Rourke, Donald Williams, Kalins Banerjee, Xiang Zhan, Ingrid U Scott, Seth Pantanelli; Repeatability and Reliability of a Combined Dual-Scheimpflug Placido Disc Corneal Topographer in Eyes with Keratoconus. Invest. Ophthalmol. Vis. Sci. 2019;60(9):2114.

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

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Abstract

Purpose : To investigate the repeatability and reliability of a combined Dual-Scheimpflug Placido disc corneal topographer (Zeimer Galilei G4) with respect to various keratometric indices used to monitor progression of keratoconus (KCN).

Methods : Patients with KCN evaluated at an academic medical center between 9/2017 and 11/2018 were prospectively enrolled in the study. For each eye that lacked a history of corneal surgery, 5 topographic measurements were taken in succession. Only eyes in which 3 high quality measurements could be obtained (as defined by the topographer’s 4 quality metrics) were included in the analysis. The repeatability limit and interclass correlation coefficient (ICC) were calculated for various topographic parameters.

Results : 23 eyes from 17 patients met criteria for inclusion in the data analysis. Repeatability limits for key parameters included: 0.83 diopters (D) for maximum keratometry in the central cornea, 0.32 D for maximum keratometry, 10.66 degrees for corneal astigmatism axis, 0.25 um for vertical coma magnitude, and 3.79 um for thinnest corneal thickness. The ICC for all parameters was excellent (above 0.97) except for spherical aberration (0.71).

Conclusions : The combined Dual-Scheimpflug Placido disc corneal topographer is highly repeatable and reliable in quantifying most parameters typically used in monitoring KCN. More eyes are needed to confirm these results, and analysis of measurement repeatability and reliability in eyes with imperfect image quality may also prove useful.

This abstract was presented at the 2019 ARVO Annual Meeting, held in Vancouver, Canada, April 28 - May 2, 2019.

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