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A glaucomatous patient with progressed optic nerve cupping as shown by the color fundus images of optic nerve head (ONH) taken at an early time (left picture) and a late time (middle picture) after about 53 months. The right picture shows the annotation of main ONH landmarks. Neuroretinal rim, defined as the region between optic disc and cup boundaries, manifest as a “lantern ring” around the optic disc center.
