TY - JOUR
T1 - Corneoscleral Topography Measured with Fourier-based Profilometry and Scheimpflug Imaging
AU - Bandlitz, Stefan
AU - Esper, Patrick
AU - Stein, Magdalena
AU - Dautzenberg, Torsten
AU - Wolffsohn, James S
N1 - This is the author's accepted manuscript of the following article: Bandlitz, Stefan PhD, MS, FCOptom; Esper, Patrick Staatl. gepr. Aug; Stein, Magdalena Staatl. gepr. Aug; Dautzenberg, Torsten Dipl.-Kfm. (FH); Wolffsohn, James S. PhD, BSc, FCOptom, FAAO. Corneoscleral Topography Measured with Fourier-based Profilometry and Scheimpflug Imaging, Optometry and Vision Science: September 15, 2020 - Volume Pre-Publication - Issue - doi: 10.1097/OPX.0000000000001572
PY - 2020/9/15
Y1 - 2020/9/15
N2 - SIGNIFICANCE: Precise measurement of corneoscleral topography makes a valuable contribution to the understanding of anterior eye anatomy and supports the fitting process of contact lenses. Sagittal height data, determined by newer noninvasive techniques, are particularly useful for initial scleral lens selection.PURPOSE: The purpose of this study was to investigate the agreement and repeatability of Fourier-based profilometry and Scheimpflug imaging, in the measurement of sagittal height and toricity of the corneoscleral region.METHODS: Minimal (Minsag), maximal (Maxsag) sagittal height, toricity (Maxsag - Minsag), and the maximum possible measurement zone diameter of 38 subjects were compared using the Eye Surface Profiler (ESP; Eagle Eye, Houten, the Netherlands) and the corneoscleral profile module of the Pentacam (Oculus, Wetzlar, Germany) at two different sessions. Correlations between the instruments were analyzed using the Pearson coefficient. Differences between sessions and instruments were analyzed using Bland-Altman and paired t tests.RESULTS: For an equal chord length, the measurement with Pentacam was significantly greater for Minsag (344 μm; 95% confidence interval [CI], 322 to 364 μm; P < .001) and significantly greater for Maxsag (280 μm; 95% CI, 256 to 305 μm; P < .001), but significantly smaller for toricity (-63 μm; 95% CI, -95 to -31 μm; P < .001). Maximum possible measurement zone diameter with ESP (16.4 ± 1.3 mm) was significantly greater than with Pentacam (14.8 ± 1.1 mm) (P < .001). Repeated measurements from session 1 and session 2 were not significantly different for Pentacam and ESP (P = .74 and P = .64, respectively). The 95% CIs around differences indicate good repeatability for Pentacam (mean difference, -0.9 μm; 95% CI, -6.7 to 4.8 μm) and ESP (4.6 μm; -22.4 to 31.6).CONCLUSIONS: Although both instruments deliver useful data especially for the fitting of scleral and soft contact lenses, the sagittal height and the toricity measurements cannot be considered as interchangeable.
AB - SIGNIFICANCE: Precise measurement of corneoscleral topography makes a valuable contribution to the understanding of anterior eye anatomy and supports the fitting process of contact lenses. Sagittal height data, determined by newer noninvasive techniques, are particularly useful for initial scleral lens selection.PURPOSE: The purpose of this study was to investigate the agreement and repeatability of Fourier-based profilometry and Scheimpflug imaging, in the measurement of sagittal height and toricity of the corneoscleral region.METHODS: Minimal (Minsag), maximal (Maxsag) sagittal height, toricity (Maxsag - Minsag), and the maximum possible measurement zone diameter of 38 subjects were compared using the Eye Surface Profiler (ESP; Eagle Eye, Houten, the Netherlands) and the corneoscleral profile module of the Pentacam (Oculus, Wetzlar, Germany) at two different sessions. Correlations between the instruments were analyzed using the Pearson coefficient. Differences between sessions and instruments were analyzed using Bland-Altman and paired t tests.RESULTS: For an equal chord length, the measurement with Pentacam was significantly greater for Minsag (344 μm; 95% confidence interval [CI], 322 to 364 μm; P < .001) and significantly greater for Maxsag (280 μm; 95% CI, 256 to 305 μm; P < .001), but significantly smaller for toricity (-63 μm; 95% CI, -95 to -31 μm; P < .001). Maximum possible measurement zone diameter with ESP (16.4 ± 1.3 mm) was significantly greater than with Pentacam (14.8 ± 1.1 mm) (P < .001). Repeated measurements from session 1 and session 2 were not significantly different for Pentacam and ESP (P = .74 and P = .64, respectively). The 95% CIs around differences indicate good repeatability for Pentacam (mean difference, -0.9 μm; 95% CI, -6.7 to 4.8 μm) and ESP (4.6 μm; -22.4 to 31.6).CONCLUSIONS: Although both instruments deliver useful data especially for the fitting of scleral and soft contact lenses, the sagittal height and the toricity measurements cannot be considered as interchangeable.
UR - https://journals.lww.com/optvissci/Abstract/9000/Corneoscleral_Topography_Measured_with.98085.aspx
UR - http://www.scopus.com/inward/record.url?scp=85091808861&partnerID=8YFLogxK
U2 - 10.1097/OPX.0000000000001572
DO - 10.1097/OPX.0000000000001572
M3 - Article
C2 - 32941338
SN - 1040-5488
VL - 97
SP - 766
EP - 774
JO - Optometry and Vision Science
JF - Optometry and Vision Science
IS - 9
ER -