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Journal of Ophthalmology
Volume 2012, Article ID 487309, 14 pages
http://dx.doi.org/10.1155/2012/487309
Clinical Study

Reproducibility of Scleral Spur Identification and Angle Measurements Using Fourier Domain Anterior Segment Optical Coherence Tomography

1Ruiz Department of Ophthalmology and Visual Science, The University of Texas Medical School at Houston, 6431 Fannin Street, MSB 7.024, Houston, TX 77030, USA
2Ophthalmology Department, Medical School, University of Puerto Rico, Medical Sciences Campus, P.O. Box 365067, San Juan, PR 00936, USA
3Glaucoma Center of San Francisco, 55 Stevenson Street, San Francisco, CA 94105, USA
4Department of Ophthalmology, University of California, San Francisco, 10 Koret Way, Room K-300, P.O. Box 0730, San Francisco, CA 94143, USA
5Robert Cizik Eye Clinic, 6400 Fannin Street, Suite 1800, Houston, TX 77030, USA
6Department of Ophthalmology, The University of Texas Health Science Center at San Antonio, 7703 Floyd Curl Drive, Mail Code 6230, San Antonio, TX 78229, USA

Received 10 July 2012; Accepted 5 September 2012

Academic Editor: Norma Allemann

Copyright © 2012 Ricardo J. Cumba et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Supplementary Material

Illustrations are Edit and Save Functions in Anterior Chamber Analysis and Interpretation (ACAI) software. After manually identifying the scleral spur landmark (SSL [SS in the figure]), click on the edge detection button (not shown), and the anterior and posterior corneal edges as well as the anterior iris are automatically detected (A, yellow lines). In some eyes, especially nonopen angle eyes, iris surface detection may need manual adjustment (B, green line). Trabecular Iris Surface Area at 750 μm (TISA750) and Angle Opening Distance at 750 μm (AOD750) can be calculated based on the identified SSL and the edited edges (not shown). The edited iris can then be saved to a file (C). To compare TISA750 and AOD750 calculations obtained from the other set of SSL identifications on the same image, the saved iris file would be loaded first (D). After the SSL is identified and the edges automatically detected (by the yellow lines, as in A), the user then clicks on “Get Edit Iris” (E). The iris surface edge is from the previous saved iris file (F). The impact of SSL on TISA750 and AOD750 can then be examined with the same manually edited iris edges.

  1. Supplementary Figure