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Comparison of Optic Disc Margin Identified by Color Disc Photography and High-Speed Ultrahigh-Resolution Optical Coherence Tomography
Anita Manassakorn, MD;
Hiroshi Ishikawa, MD;
Jong S. Kim, MSc;
Gadi Wollstein, MD;
Richard A. Bilonick, PhD;
Larry Kagemann, MSc;
Michelle L. Gabriele, BSc;
Kyung Rim Sung, MD;
Tarkan Mumcuoglu, MD;
Jay S. Duker, MD;
James G. Fujimoto, PhD;
Joel S. Schuman, MD
Arch Ophthalmol. 2008;126(1):58-64.
Objective To determine the correspondence between optic disc margins evaluated using disc photography (DP) and optical coherence tomography (OCT).
Methods From May 1, 2005, through November 10, 2005, 17 healthy volunteers (17 eyes) had raster scans (180 frames, 501 samplings per frame) centered on the optic disc taken with stereo-optic DP and high-speed ultrahigh-resolution OCT (hsUHR-OCT). Two image outputs were derived from the hsUHR-OCT data set: an en face hsUHR-OCT fundus image and a set of 180 frames of cross-sectional images. Three ophthalmologists independently and in a masked, randomized fashion marked the disc margin on the DP, hsUHR-OCT fundus, and cross-sectional images using custom software. Disc size (area and horizontal and vertical diameters) and location of the geometric disc center were compared among the 3 types of images.
Results The hsUHR-OCT fundus image definition showed a significantly smaller disc size than the DP definition (P <.001, mixed-effects analysis). The hsUHR-OCT cross-sectional image definition showed a significantly larger disc size than the DP definition (P <.001). The geometric disc center location was similar among the 3 types of images except for the y-coordinate, which was significantly smaller in the hsUHR-OCT fundus images than in the DP images.
Conclusion The optic disc margin as defined by hsUHR-OCT was significantly different than the margin defined by DP.
Author Affiliations: UPMC Eye Center, Ophthalmology and Visual Science Research Center, Eye and Ear Institute, Department of Ophthalmology, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania (Drs Manassakorn, Ishikawa, Wollstein, Bilonick, Sung, Mumcuoglu, and Schuman, Messrs Kim and Kagemann, and Ms Gabriele); New England Eye Center, Tufts-New England Medical Center, Boston, Massachusetts (Dr Duker); and Department of Electrical Engineering and Computer Science and Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge (Dr Fujimoto).
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