Optic cup (anatomical)

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excavatio disci
Latin excavatio disci
TA A15.2.04.020
FMA 77664
Anatomical terminology

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

The ratio of the size of the optic cup to the optic disc (or cup-to-disc ratio) is measured to diagnose glaucoma. A normal cup to disc ratio is 0.3; a larger ratio may suggest glaucoma.


  1. ^ Algazi VR, Keltner JL, Johnson CA (December 1985). "Computer analysis of the optic cup in glaucoma". Invest. Ophthalmol. Vis. Sci. 26 (12): 1759–70. PMID 4066212. [dead link]