Optic cup (anatomical)
Wiggle stereogram showing the optic cup in a healthy eye
The ratio of the size of the optic cup to the optic disc (cup-to-disc ratio, or C/D) is one measure used in the diagnosis of glaucoma. Different C/D's can be measured horizontally or vertically in the same patient. C/D's vary widely in healthy individuals. However, larger vertical C/D's, or C/D's which are very different between the eyes, may raise suspicion for glaucoma. A C/D which enlarges vertically over months or years suggests glaucoma.
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