The optic cup is the white, cup-like area in the center of the optic disc.
The ratio of the size of the optic cup to the optic disc (or cup-to-disc ratio) is measured to diagnose glaucoma. Normal cup to disc ratio is 0.3 If it is more than it suggests glaucoma.
Famous quotes containing the word cup:
“The morning cup of coffee has an exhiliration about it which the cheering influence of the afternoon or evening cup of tea cannot be expected to reproduce.”
—Oliver Wendell Holmes, Sr. (1809–1894)