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- Title
Corneal Parameters Measurement in Healthy Subjects Using Scheimpflug and Anterior Segment Optical Coherence Tomography.
- Authors
Rattan, Suzan Amana
- Abstract
Purpose: To compare the central corneal thickness (CCT), minimum corneal thickness (MCT) and corneal power measured using the Scheimpflug-Placido device and optical coherence tomography (OCT) in healthy eyes. Study Design: Descriptive observational. Place and Duration of Study: Al-Kindy college of medicine/university of Baghdad, from June 2021 to April 2022. Methods: A total of 200 eyes of 200 individuals were enrolled in this study. CCT and MCT measurements were carried out using spectral-domain optical coherence tomography (Optovue) and a Scheimpflug-Placido topographer (Sirius). The agreement between the two approaches was assessed using Bland-Altman analysis in this study. Results: Mean age was 28.54 ± 6.6 years, mean spherical equivalent of refraction was -3.57 ± 3.35 D. Mean CCT by Optovue, and Sirius were 534.13 ± 27.88 μm, and 540.2 ± 27.85 μm, respectively. Mean CCT differences between them were -6.070 ± 6.593 μm, (p < 0.05). Minimum thickness by Optovue was 526.79 ± 27.81, and by Sirius was 537.44 ± 27.56, mean difference between the two devices was 10.66 ± 6.89, p = 0.00. The net power by OCT was 43.44 ± 1.456, mean K by Sirius was 43.597 ± 1.408, with p = 0.000. Maximum level of agreement between the two devices is -18.99 to 6.85 for CCT, is widest for minimum thickness -24.166 to 2.85 and narrowest for differences between net corneal power by OCT and mean K By Sirius is -0.87 to 1.18. Conclusion: In clinical practice, the two devices cannot be used interchangeably. CCT and keratometry should be evaluated and followed up using the same device.
- Subjects
BAGHDAD (Iraq); CONTACT lenses; EYE physiology; OPTICAL coherence tomography; BLAND-Altman plot
- Publication
Pakistan Journal of Ophthalmology, 2023, Vol 39, Issue 4, p273
- ISSN
0886-3067
- Publication type
Article
- DOI
10.36351/pjo.v39i4.1666