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Abstract #3436 Published in IGR 4-2
The Autocad system for planimetric study of the optic disc in glaucoma: technique and reproducibility study
Sanchez Perez A; Honrubia Lopez FM; Larrosa Poves JM; Polo Llorens V; Melcon Sanchez Frieras BArchivos de la Sociedad Espaņola de Oftalmologia 2001; 76: 551-558
PURPOSE: To develop a lens planimetry technique for the optic disc using AutoCAD. To determine variability magnitude of the optic disc morphological measurements. METHODS: The authors employed AutoCAD R.14.0 Autodesk: image acquisition, contour delimitation by multiple lines fitting or ellipse adjustment, image sectorialization and measurements quantification (optic disc and excavation, vertical diameters, optic disc area, excavation area, neuroretinal sector area and Beta atrophy area). Intraimage or operator and interimage of total reproducibility was studied by coefficient of variability (CV) (n = 10) in normal and myopic optic discs. RESULTS: This technique allows optic disc measurement to be obtained within five to ten minutes. Total or interimage variability of measurements introduced by one observer gives a CV range of from 1.18-4.42. Operator or intraimage measurement gives a CV range of from 0.30-4.21. Optic disc contour delimitation by ellipse adjustment achieved better reproducibility results than multiple lines adjustment in all measurements. CONCLUSIONS: Computer assisted AutoCAD planimetry is an interactive method for analyzing the optic disc, which is feasible to be incorporated into clinical practice. Reproducibility results are comparable to other analyzers in quantification optic disc morphology. Ellipse adjustment improves results in optic disc contour delimitation. LA: Spanish
Dr A Sanchez Perez, Servicio de Oftalmologia, Hospital Miguel Servet, INSALUD, Zaragoza, Spain
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)