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M. F. Armaly; Optic Cup in Normal and Glaucomatous Eyes. Invest. Ophthalmol. Vis. Sci. 1970;9(6):425-429.
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Enlargement of the optic cup occurs early in the clinical course of open-angle glaucoma and results in inequality of this ratio in the 2 eyes. The enlargement, in general, parallels the magnitude of field defect. It is suggested that involvement of the visual field in eyes with ocular hypertension is related to the cup disc ratio (C/D), being more frequent in eyes with genetically large cups
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