Optic cup (anatomical)

The optic cup is the white, cup-like area in the center of the optic disc.[1]

Optic cup
Wiggle stereogram showing the optic cup in a healthy eye
Latinexcavatio disci
Anatomical terminology

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/Ds can be measured horizontally or vertically in the same patient. C/Ds vary widely in healthy individuals. However, larger vertical C/Ds, or C/Ds which are very different between the eyes, may raise suspicion of glaucoma. A C/D which enlarges vertically over months or years suggests glaucoma.


  1. Algazi VR, Keltner JL, Johnson CA (December 1985). "Computer analysis of the optic cup in glaucoma". Investigative Ophthalmology & Visual Science. 26 (12): 1759–70. PMID 4066212.

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