Optic cup (anatomical)

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Optic cup
Optic cup and macula - 3D motion parallax.gif
Wiggle stereogram showing the optic cup in a healthy eye
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 (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.


  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.