The cup-to-disc ratio and central retinal vein occlusion
E. R. Strahlman, P. M. Quinlan, C. Enger and M. J. Elman
Dana Center for Preventive Ophthalmology, Johns Hopkins Hospital, Baltimore, Md.
Recent reports have suggested that a small optic cup may contribute to the
development of certain optic disc disorders, such as anterior ischemic
optic neuropathy. In a masked fashion, the cup-to-disc ratios from the
fellow eyes of 55 patients with central retinal vein occlusion (CRVO) were
compared with 55 controls to determine whether a similar association could
be established for CRVO. Controls came from two population-based surveys,
and they were matched to cases for age, race, and sex. The mean cup-to-disc
ratios for the CRVO fellow eyes and controls were 0.39 and 0.40,
respectively; the distribution of the sizes of the cup-to-disc ratios was
nearly identical in the two groups. These results suggested that the
cup-to-disc ratio is not a useful predictor of the development of CRVO.
