Kumar, Mukesh, Shetty, Rohit, Jayadev, Chaitra and Dutta, Debarun (2015). Comparability and repeatability of pachymetry in keratoconus using four noncontact techniques. Indian journal of ophthalmology, 63 (9), pp. 722-727.
Abstract
Purpose: To compare and determine the repeatability of central corneal thickness (CCT) measurements using four noncontact pachymetry instruments in eyes with keratoconus. Materials and Methods: The CCT of consecutive patients with keratoconus was measured during a single visit using the swept source optical coherence tomography (SS-OCT, Casia SS-1000°CT, Tomey, Nagoya, Japan), a rotating Scheimpflug camera system (Pentacam, Oculus Optikgerate GmbH, Wetzlar, Germany), scanning slit topographer (Orbscan IIz topography, Baush and Lomb Surgical Inc., San Dimas, CA, USA), and a hand-held spectral domain OCT (HHSD-OCT, Bioptigen Inc., Durham, North Carolina, USA). Test-retest variability, correlation between measurements and interdevice agreement were analyzed. Results: Fifty eyes of 25 participants were analyzed in this study. All measurement methods correlated well with each other (r > 0.9, P < 0.001). Mean ± standard deviation CCT measured by HHSD-OCT, Orbscan IIz, SS-OCT, and Pentacam was 462 ± 41 mm, 458 ± 41 mm, 454 ± 40 mm, and 447 ± 42 mm, respectively. While the HHSD-OCT over-estimated the CCT (P < 0.001), there was a good correlation between the measurements obtained from the other three devices. However, the numerical difference was high and this trend was seen in all the paired comparisons.Conclusions: Though the measurements by different devices correlated well, the numerical agreement may be inadequate for their interchangeable use in clinical practice.
Publication DOI: | https://doi.org/10.4103/0301-4738.170987 |
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Divisions: | College of Health & Life Sciences > School of Optometry > Optometry |
Additional Information: | Creative Commons Attribution Non-Commercial Share Alike License. Kumar M, Shetty R, Jayadev C, Dutta D. Comparability and repeatability of pachymetry in keratoconus using four noncontact techniques. Indian J Ophthalmol 2015;63:722-7. |
Uncontrolled Keywords: | Central corneal thickness,hand-held spectral domain optical coherence tomography,ultrasound pachymetry,Ophthalmology |
Publication ISSN: | 1998-3689 |
Last Modified: | 06 Aug 2024 08:22 |
Date Deposited: | 09 Apr 2019 07:55 |
Full Text Link: | |
Related URLs: |
http://www.scop ... tnerID=8YFLogxK
(Scopus URL) http://www.ijo. ... 27;aulast=Kumar (Publisher URL) |
PURE Output Type: | Article |
Published Date: | 2015-12-03 |
Accepted Date: | 2015-11-12 |
Authors: |
Kumar, Mukesh
Shetty, Rohit Jayadev, Chaitra Dutta, Debarun ( ![]() |
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