Rate of visual field loss in progressive glaucoma.

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Abstract
GLAUCOMA IS a widespread chronic optic neuropathy characterized by excavation of the optic nerve head and typical visual field (VF) defects; in approximately 60% to 70%1-4 of cases it is accompanied by elevated intraocular pressure (IOP). Despite presumed effective IOP-lowering therapy and after a considerable period of IOP at estimated target, deterioration of VFs is known to occur.5 In previous work6 it was observed that patients with normal-pressure glaucoma (NPG) and without disc hemorrhages (DHs) showed deterioration in 3.6% of cases per year. This rate was not different from the proportion of 3.9% of cases per year observed in patients with primary open-angle glaucoma (POAG) without DHs in that study.