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Increased intraocular pressure, typically exceeding 21 mm Hg. This condition, present in glaucoma, may predispose affected persons to optic nerve damage and visual field loss.
See also: hypertension
A condition in which the intraocular pressure (IOP) is above normal (>21 mmHg) but in which there are neither visual field defects nor optic disc changes. Open-angle glaucoma may or may not develop later: risk factors include thin central corneal thickness, large cup/disc ratio, high IOP and lack of treatment to reduce IOP greater than 30 mmHg.