Cup-disc ratio and ischemic optic neuropathy
S. Doro and S. Lessell
Cup-disc ratios in the fellow eyes of 26 patients with unilateral,
nonarteritic, anterior ischemic optic neuropathy were compared with the
ratios in fellow eyes of 29 patients with unilateral idiopathic or
demyelinative optic neuritis. The ratios in both groups were also compared
with the ratios of a large group of normal subjects evaluated in a
population survey. Observers measured the cup-disc ratio by viewing color
stereophotographs. The cup-disc ratios of the fellow eyes of patients with
anterior ischemic optic neuropathy were significantly smaller on average
than were those of the fellow eyes of patients with optic neuritis and the
normal subjects. Eyes with small cup-disc ratios may be more vulnerable to
infarction than are eyes with large cup-disc ratios.
