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Examples of optic disc (OD) and optic cup (OC) appearance from REFUGE [4] dataset. The first row shows different colors of optic disc, which are (a) Yellowish OD, (b) Whitish OD, (c) Reddish OD, (d) Brownish OD. The second row shows several challenging examples, which are (e) obscure border between optic disc and cup, (f, g) blurred border between optic disc and other area and (h) structure change of OD.
