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Abstract #15697 Published in IGR 2-3
Detection of changes of the optic disc in glaucomatous eyes: clinical examination and image analysis with the Topcon Imagenet system
Azuara-Blanco A; Katz LJ; Spaeth GL; Nicholl J; Lanzl IMActa Ophthalmologica Scandinavica 2000; 78: 647-650
PURPOSE: This study was designed to evaluate the clinical agreement in the detection of optic disc changes and the ability of computerized image analysis to detect glaucomatous deterioration of the optic disc. METHODS: Pairs of stereophotographs of 35 glaucomatous optic discs taken five years apart and of five glaucomatous discs photographed twice on the same day. Two glaucoma specialists examined the pairs of stereophotographs (35 cases and five controls) in a masked manner and judged whether the optic disc showed changes in the optic disc compatible with progression of glaucomatous damage. The stereophotographs of the five optic discs photographed twice on the same day (which by definition did not change) and of five cases judged to have deteriorated by both glaucoma specialists were analyzed by computerized image analysis with the Topcon ImageNet system. Intra- and inter-observer agreement in the detection of optic disc changes (evaluated using kappa statistic), and changes in the rim area to disc area ratio (evaluated using descriptive statistics and paired t test). RESULTS: Intra-observer agreement had a kappa value of 0.75 for observer 1 and 0.60 for the observer 2. Inter-observer agreement between the glaucoma specialists had a kappa value of 0.60. The image analyzer did not discriminate between controls and cases with clinically apparent glaucomatous change of the optic disc. CONCLUSIONS: Clinical agreement in detecting changes in the optic disc was moderate to substantial. Computerized image analysis with the Topcon ImageNet system appeared not to be useful in detecting glaucomatous changes of the optic disc.
Dr. A. Azuara-Blanco, Glaucoma Unit, Princess Alexandra Eye Pavillion, University of Edinburgh, Chalmers Street, Edinburgh EH3 9HA, UK
Classification:
2.14 Optic disc (Part of: 2 Anatomical structures in glaucoma)
6.9.5 Other (Part of: 6 Clinical examination methods > 6.9 Computerized image analysis)
