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:
“It is surely easier to confess a murder over a cup of coffee than in front of a jury.”
—Friedrich Dürrenmatt (1921–1990)