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(Cirrus HD-OCT) Quality score is within normal limits in a scan from a patient with optic nerve head drusen. However, note that although the diameter of the disc is normal, the cup volume value is 0. Despite significant RNFL thinning, neuroretinal rim thickness is higher than normal values in optic nerve head measurements
RNFL: Retinal nerve fiber layer, OCT: Optical coherence tomography
