Comparability and repeatability of pachymetry in keratoconus using four noncontact techniques.
| dc.contributor.author | Kumar, Mukesh | |
| dc.contributor.author | Shetty, Rohit | |
| dc.contributor.author | Jayadev, Chaitra | |
| dc.contributor.author | Dutta, Debarun | |
| dc.date.accessioned | 2016-11-25T10:38:32Z | |
| dc.date.available | 2016-11-25T10:38:32Z | |
| dc.date.issued | 2015-09 | |
| dc.description.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 μm, 458 ± 41 μm, 454 ± 40 μm, and 447 ± 42 μm, 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. | en_US |
| dc.identifier.citation | Kumar Mukesh, Shetty Rohit, Jayadev Chaitra, Dutta Debarun. Comparability and repeatability of pachymetry in keratoconus using four noncontact techniques. Indian Journal of Ophthalmology. 2015 Sept; 63(9): 722-727. | en_US |
| dc.identifier.uri | https://imsear.searo.who.int/handle/123456789/178890 | |
| dc.language.iso | en | en_US |
| dc.source.uri | https://www.ijo.in/article.asp?issn=0301-4738;year=2015;volume=63;issue=9;spage=722;epage=727;aulast=Kumar | en_US |
| dc.subject | Central corneal thickness | en_US |
| dc.subject | hand‑held spectral domain optical coherence tomography | en_US |
| dc.subject | ultrasound pachymetry | en_US |
| dc.title | Comparability and repeatability of pachymetry in keratoconus using four noncontact techniques. | en_US |
| dc.type | Article | en_US |