July 2018
Volume 59, Issue 9
Open Access
ARVO Annual Meeting Abstract  |   July 2018
Analysis of which device is reliable for measuring central corneal thickness in novice examiner
Author Affiliations & Notes
  • Yujeong Kim
    ophthalmology, Hanyang university hospital, Seoul, Korea (the Republic of)
  • Joo Young Joung
    ophthalmology, Hanyang university hospital, Seoul, Korea (the Republic of)
  • So Jung Ryu
    ophthalmology, Hanyang university hospital, Seoul, Korea (the Republic of)
  • Han Woong Lim
    ophthalmology, Hanyang university hospital, Seoul, Korea (the Republic of)
  • Footnotes
    Commercial Relationships   Yujeong Kim, None; Joo Young Joung, None; So Jung Ryu, None; Han Woong Lim, None
  • Footnotes
    Support  None
Investigative Ophthalmology & Visual Science July 2018, Vol.59, 5733. doi:
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    • Get Citation

      Yujeong Kim, Joo Young Joung, So Jung Ryu, Han Woong Lim; Analysis of which device is reliable for measuring central corneal thickness in novice examiner. Invest. Ophthalmol. Vis. Sci. 2018;59(9):5733.

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

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Abstract

Purpose : Ultrasound pachymetry (USP) is the most commonly used and gold standard for measuring central corneal thickness (CCT), but it can be difficult for novice examiner. We evaluate the most reliable device to measure CCT for a novice examiner using four different methods.

Methods : A novice examiner and an expert examiner measured CCT in 17 healthy eyes using dual rotating Scheimpflug camera, optical coherence tomography (OCT), noncontact specular microscopy (NCSM), and USP. CCT of the same subject was measured twice by a novice, and once by an expert. The paired t-test was used to compare CCT values of expert and novice examiner. Inter-examiner repeatability was evaluated by intraclass correlation coefficient (ICC). Agreement among the devices measured by novice examiner was analyzed using Pearson’s correlation coefficient and Bland–Altman analysis.

Results : The CCT measurements were not statistically different between the measured value of the expert and the mean value of the novice for all devices. The mean value of the CCT measured twice by the novice examiner using dual rotating Scheimpflug camera, OCT, NCSM and USP were 533.38 ± 41.45 μm, 504.38 ± 39.01 μm, 490.38 ± 37.62 μm and 521.73 ± 39.26 μm, respectively. The ICCs of dual rotating Scheimpflug camera, OCT, NCSM and USP were 0.972, 0.996, 0.988 and 0.990. A significant linear correlation was observed among all devices (r > 0.900, p < 0.001), except NCSM and USP (r = 0.875, p = 0.086). Bland-Altman analysis demonstrated low mean biases between devices.

Conclusions : All CCT measurements using 4 devices have no significant differences between expert and novice, and the OCT was the least different. For novice, the values of the CCT measured by four devices show good repeatability and strong correlation with each other.

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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