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But with normal-tension glaucoma, the optic nerve becomes damaged even though eye pressure stays within normal levels. Your doctor may call it "low-tension" or "normal-pressure" glaucoma. Glaucoma is a disease affecting the optic nerve and can result in permanent, irreversible vision loss. While most cases of glaucoma are associated with higher than average eye pressures, normal-tension glaucoma (and low-tension glaucoma) is a unique condition in which glaucomatous optic nerve damage (optic neuropathy) occurs despite an average or below average eye pressure. · Normal-tension glaucoma (NTG), also known as low tension or normal pressure glaucoma, is a form of glaucoma in which damage occurs to the optic nerve without eye pressure exceeding the normal range. In general, a "normal" pressure range is between mm Hg. What Causes Normal-tension Glaucoma? The causes of NTG are still unknown. For some reason, the . The long term follow up of surgery in normal tension glaucoma is presented. One eye of 18 patients with bilateral progressive disease underwent fistulising surgery. Over follow up periods ranging from 2 to 7 years (50% > or = 5 years) the operated eye showed on average a 30% reduction in intraocular pressure (IOP). This was associated with a marked difference in the rate and number of retinal Location: Rockville Pike, Bethesda, MD. Normal-tension glaucoma (NTG) is a progressive optic neuropathy with intraocular pressure (IOP) within the statistically normal range (≤21 mmHg). The prevalence of NTG varies widely among different population studies, being the most prevalent open-angle glaucoma subtype in some reports. The etiology of NTG possibly is multifactorial and still not well defined. Alternative treatments have. · Normal-tension glaucoma is treated in the same way as POAG by reducing the eye pressure using medications, laser treatment, and surgery. Blood flow to the optic nerve may play an important role in NTG but currently there is no treatment that can directly modify it. If high blood pressure is over-treated with medications, the optic nerve blood flow may be affected. Your eye doctor may . · One form of glaucoma is commonly referred to as normal-tension glaucoma (NTG). Occurring in certain conditions, when optic nerve damage happens even when the IOP is below the normal level of 21 mm Hg. Normal tension glaucoma (NTG) is an eye disease, a neuropathy of the optic nerve, that shows all the characteristics of "traditional" glaucoma except one: the elevated intraocular pressure (IOP) - the classic hallmark of glaucoma - is missing. Normal tension glaucoma is in many cases closely associated with general issues of blood circulation and of organ perfusion like arterial hypotension. Normal-tension glaucoma (NTG) is characterized by damage to the optic nerve and normal eye pressure that does not exceed 21 mmHg. Learn about the symptoms and treatment for low-tension or normal-pressure glaucoma. Normal tension glaucoma (NTG) is an optic nerve neuropathy that presents with optic disc excavation, visual field loss in spite of intraocular pressure. Yet, the myth that elevated IOP must be present for a diagnosis of glaucoma persists, which means that many clinicians frequently fail to detect normal tension glaucoma (NTG) until it reaches an advanced stage. If a clinician fails to suspect NTG in patients whose IOP lies within the normal range (12–22 mmHg), they may decide not to perform a.