This condition is similar to primary open-angle glaucoma except that the intraocular pressure is within normal limits (i.e., 21 mmHg or less at the initial and subsequent visits). The condition is probably caused by low perfusion pressure at the optic nerve head so that the nerve head is susceptible to damage at normal intraocular pressure.
Certain conditions that can mimic normal pressure glaucoma include compressive lesions of the optic nerve and chiasma, carotid ischemia and congenital optic disc anomalies.
Treatment of normal-pressure glaucoma aims to reduce intraocular pressure to 12mmHg or less.
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