March 2012
Volume 53, Issue 14
Free
ARVO Annual Meeting Abstract  |   March 2012
Comparative Measurements Of Pachymetry By The Anterior Segment Module (ASM) Of Spectralis-OCT And By Ultrasound, SL-OCTAnd Pentacam
Author Affiliations & Notes
  • Michael Haustein
    Dept Ophthalmology, University of Dresden, Dresden, Germany
  • Kathleen Wozniak
    Dept Ophthalmology, University of Dresden, Dresden, Germany
  • Eberhard Spoerl
    Dept Ophthalmology, University of Dresden, Dresden, Germany
  • Lutz E. Pillunat
    Dept Ophthalmology, University of Dresden, Dresden, Germany
  • Footnotes
    Commercial Relationships  Michael Haustein, None; Kathleen Wozniak, None; Eberhard Spoerl, None; Lutz E. Pillunat, None
  • Footnotes
    Support  None
Investigative Ophthalmology & Visual Science March 2012, Vol.53, 98. doi:
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      Michael Haustein, Kathleen Wozniak, Eberhard Spoerl, Lutz E. Pillunat; Comparative Measurements Of Pachymetry By The Anterior Segment Module (ASM) Of Spectralis-OCT And By Ultrasound, SL-OCTAnd Pentacam. Invest. Ophthalmol. Vis. Sci. 2012;53(14):98.

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Abstract

Purpose: : To compare central corneal thickness (CCT) by ASM and 3 other pachymetry devices: SL-OCT, Pentacam and Tomey ultrasound-pachymetry. CCT measurements were correlated to anterior camber depth and curvature.

Methods: : 142 eyes of 71 normal subjects were included in this prospective, cross- sectional observational study. Three central corneal thickness measurements were randomly performed by SL-OCT, by ASM and Pentacam. Ultrasound measurements were taken at last. The statistical analyses were done by SPSS®. For comparison the mean values, the intraclass correlation coefficients (ICC) and the Bland-Altman-plots were used.

Results: : Mean CCT by ASM, SL-OCT, Pentacam, and Tomey SP3000 was 550.65±37.05 µm, 542.58±38.06 µm, 544.5±38.37 µm, and 548.97±46.27µm, respectively. The difference and the ICC between ASM-SLOCT was -7.5±21.8 µm (P=0.007), ICC = 0.820, between ASM-Tomey -1.19±24.9 µm (P=0.694), ICC=0.819, and between ASM-Pentacam -7.0±21.2 µm (P=0.007), ICC=0.824.ASM CCT was not significantly different from CCT measured by ultrasound pachymetry. In contrast, the other two non contact devices measured slightly thinner than ASM (P<0.007). There were no statistically significant correlations to anterior camber depth and corneal curvature.

Conclusions: : The AMS provides sufficient CCT and the results are comparable to other pachymetric devices, like SL-OCT, Pentacam, and Tomey SP3000. Differences in CCT between the four devices are not clinically relevant. Therefore, all used measurement devices are interchangeable.

Keywords: cornea: clinical science • imaging/image analysis: clinical • imaging methods (CT, FA, ICG, MRI, OCT, RTA, SLO, ultrasound) 
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