Agreement Between Swept-Source Optical Biometry and Scheimpflug-based Topography Measurements of Posterior Corneal Curvature

2021 ◽  
Vol Publish Ahead of Print ◽  
Author(s):  
Bulent Kose
Keyword(s):  
Corneal Curvature ◽  
Swept Source ◽  
Optical Biometry ◽  
Posterior Corneal Curvature

Posterior Corneal Curvature Measurements With Peripheral Fitting Zones Before and After Myopic LASIK Using Orbscan II

2008 ◽  
Vol 24 (8) ◽  
pp. 807-810 ◽  
Author(s):  
Arthur C. K. Cheng ◽  
Srinivas K. Rao ◽  
Thomas Ho ◽  
Silvania Lau ◽  
Dennis S. C. Lam
Keyword(s):  
Corneal Curvature ◽  
Before And After ◽  
Curvature Measurements ◽  
Orbscan Ii ◽  
Posterior Corneal Curvature

Validation of posterior corneal curvature measurements with color light-emitting diode topography

2019 ◽  
Vol 30 (6) ◽  
pp. 1261-1267 ◽  
Author(s):  
David P Piñero ◽  
Vicent J Camps ◽  
Dolores de Fez ◽  
Celia García ◽  
María Teresa Caballero
Keyword(s):  
Correlation Coefficient ◽  
Intraclass Correlation Coefficient ◽  
Light Emitting Diode ◽  
Intraclass Correlation ◽  
Corneal Curvature ◽  
Topographic Analysis ◽  
Light Emitting ◽  
Curvature Measurements ◽  
Healthy Eyes ◽  
Posterior Corneal Curvature

Purpose: To evaluate the intrasession repeatability and validity of posterior corneal curvature and astigmatism measurements provided by a color light-emitting diode reflection topography system in healthy eyes. Methods: A total of 40 healthy eyes of 40 patients (age, 16–66 years) were enrolled. A complete eye examination was performed in all cases including posterior topographic analysis with two systems: the Scheimpflug-based system (Pentacam; Oculus Optikgeräte GmbH, Wetzlar, Germany) and the Cassini system (i-Optics; Ophthec, The Hague, The Netherlands). With this last system, three consecutive measurements were taken to assess the level of intrasession repeatability (within-subject standard deviation, Sw; intraclass correlation coefficient). The Bland & Altman analysis was used to evaluate the interchangeability of both devices. Results: The Sw was ⩽0.06 mm for all posterior corneal radius measurements, with intraclass correlation coefficient of ⩾0.960. The Sw for the magnitude of astigmatism, J0, and J45 were 0.15, 0.04, and 0.04 D, respectively, with intraclass correlation coefficient values of 0.876, 0.897, and 0.840, respectively. Statistically significant differences between devices were found in all parameters evaluated (p ⩽ 0.025). The interchangeability analysis revealed the presence of clinically relevant limits of agreement for the flattest (0.03 to 0.50 mm) and steepest posterior corneal radii (–0.01 to 0.39 mm). In contrast, limits of agreements were not clinically relevant for the magnitude of posterior astigmatism (–0.17 to 0.27 D) and their power vector components (–0.11 to 0.15 D). Conclusion: The Cassini system provides consistent measures of posterior corneal curvature and astigmatism in healthy eyes, but only measures of posterior astigmatism can be considered as interchangeable with those provided by the Pentacam.

Anterior and posterior corneal curvature: normal values in healthy Iranian population obtained with the Orbscan II

2014 ◽  
Vol 34 (6) ◽  
pp. 1213-1219 ◽  
Author(s):  
Hamid Gharaee ◽  
Mojtaba Abrishami ◽  
Mostafa Abrishami ◽  
Seyyed Mohammad Mirhosseini ◽  
Mohammad Reza Mehrabi Bahar ◽  
...  
Keyword(s):  
Normal Values ◽  
Iranian Population ◽  
Corneal Curvature ◽  
Orbscan Ii ◽  
Posterior Corneal Curvature
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