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From these contours, the system computes disc, rim, and cup areas and volumes, global and sectoral cup-to-disc and rim-to-disc ratios, plus vertical/horizontal C/D ratios, and classifies the ONH by comparing energy fits in point distribution models of normal and abnormal shapes. Automated, consistent disc and cup margin segmentation despite peripapillary atrophy or vessel occlusion. Objective, quantitative measurement of optic nerve head parameters (disc/cup areas, volumes, ratios).