cup:disc ratio

(redirected from cupdisc ratio)

cup:disc ra·ti·o

(kŭp disk rā'shē-ō)
The ratio between the diameter of the cupped or depressed central zone of the optic disc and the diameter of the entire disc; normally lower than 1:3, it is increased in glaucoma.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012
References in periodicals archive ?
Sensitivity and specificity for a cupdisc ratio greater than 0.6 have been reported to be 64% and 96%, respectively, using direct ophthalmoscopy.