Optic disc topography in patients with low-tension and primary open angle glaucoma
P. Fazio, T. Krupin, M. E. Feitl, E. B. Werner and D. A. Carre
Department of Ophthalmology, University of Pennsylvania School of Medicine, Philadelphia.
Computerized optic disc topographic measurements (cup-disc ratio,
neuroretinal rim area, disc volume) and automated visual field parameters
(total field loss, mean sensitivity) were similar in 48 eyes with primary
open angle glaucoma and 27 eyes with low-tension glaucoma. In open angle
glaucoma, the neuroretinal rim area was negatively correlated with the
cup-disc ratio and the disc volume. Total field loss was positively
correlated with the cup-disc ratio and the disc volume and negatively
correlated with the neuroretinal rim area. Eyes with low-tension glaucoma
showed a negative correlation between neuroretinal rim area and cup-disc
ratio, and between total field loss and rim area. However, low-tension
glaucomatous eyes did not have significant correlations between disc volume
and rim area and between total field loss and cup-disc ratio or disc
volume. Cupping in low-tension glaucoma was broadly sloping, resulting in
less disc volume alteration.
