cup-to-disc ratio
C2CEFR level
95/100Rarity: very rare
TechnicalRegister
The ratio of the central hollow of the optic disc to its total diameter, used to monitor glaucomatous damage.
An enlarging cup-to-disc ratio over successive visits suggests progressive glaucoma.
Rarity runs from 0 (a word everyone knows) to 100 (almost never seen outside specialist or literary writing). Level is the word's real difficulty on the CEFR scale, from A1 to C2.
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