April 2011
Volume 52, Issue 14
Free
ARVO Annual Meeting Abstract  |   April 2011
Intra- And Inter-operator Repeatability Of Manual And Semi-automated Angle Measurements With Fourier-domain Anterior-segment Oct
Author Affiliations & Notes
  • Nicola Ungaro
    Ophthalmology, University Hospital of Parma, Parma, Italy
  • Alberto Neri
    Ophthalmology, University Hospital of Parma, Parma, Italy
  • Patrizia Scaroni
    Ophthalmology, University Hospital of Parma, Parma, Italy
  • Rosachiara Leaci
    Ophthalmology, University Hospital of Parma, Parma, Italy
  • Elisabetta Delfini
    Ophthalmology, University of Parma, Parma, Italy
  • Claudio Macaluso
    Ophthalmology, University of Parma, Parma, Italy
  • Stefano A. Gandolfi
    Ophthalmology, University of Parma, Parma, Italy
  • Footnotes
    Commercial Relationships  Nicola Ungaro, None; Alberto Neri, None; Patrizia Scaroni, None; Rosachiara Leaci, None; Elisabetta Delfini, None; Claudio Macaluso, None; Stefano A. Gandolfi, None
  • Footnotes
    Support  None
Investigative Ophthalmology & Visual Science April 2011, Vol.52, 6284. doi:
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      Nicola Ungaro, Alberto Neri, Patrizia Scaroni, Rosachiara Leaci, Elisabetta Delfini, Claudio Macaluso, Stefano A. Gandolfi; Intra- And Inter-operator Repeatability Of Manual And Semi-automated Angle Measurements With Fourier-domain Anterior-segment Oct. Invest. Ophthalmol. Vis. Sci. 2011;52(14):6284.

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      © ARVO (1962-2015); The Authors (2016-present)

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Abstract
 
Purpose:
 

to assess intra- and inter-operator repeatability of irido-corneal angle measurements in open and narrow angles with a Fourier-domain anterior segment OCT (SS-1000, CASIA, Tomey Co®, Japan)

 
Methods:
 

20 eyes with normal and 15 eyes with narrow angle width were selected from a database of pre-acquired AS-OCT images. Narrow and open angles were analyzed separately. Each image was analyzed twice by one operator on two separate sessions. A second operator examined the images independently. The following parameters were evaluated: manual angle width measure (MAW), trabecular-irido angle at 500µm (TIA500), angle opening distance at 500 and 750µm (AOD500 and AOD750), angle recess area at 500 and 750µm (ARA500 and ARA750), trabecular-iris space area (TISA500 and TISA750). MAW was obtained positioning three points: corneo-scleral junction, angular recess, and iris surface (on a line intersecting the first point normally). The other parameters were obtained with a semi-automated image process, in which the only manual step was marking the scleral spur. We evaluated intra- and inter-operator repeatability of measurements using Limits of Agreement (LoA), Coefficients of Variation (CV) and Intra-Class Correlation Coefficients (ICC), and Bland-Altman plots. To assess differences between repeated measures we used the Mann-Whitney test

 
Results:
 

results are displayed in Table 1. No significant differences were found between repeated measures for all tested parameters; ICC showed good correlation between paired data both in intra- and in inter-operator data series. Data showed a tendency of repeatability to be higher in open vs narrow angles

 
Conclusions:
 

SS-1000 FD-AS-OCT showed a good intra- and inter-operator repeatability measuring angle parameters in narrow and open angles  

 
Keywords: anterior segment • imaging methods (CT, FA, ICG, MRI, OCT, RTA, SLO, ultrasound) • image processing 
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