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Optic nerves. (A) This illustrates large healthy discs with large cup/disc ratios from patients who have been followed for more than 30 years with no disc change or any other sign of glaucoma. (B) Shows a small glaucomatous optic disc without a large cup/disc ratio, but with an eccentric cup exhibiting an inferior focal notch associated with marked visual field loss. (C) Depicts a large disc with glaucomatous cupping.
