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Normal tension glaucoma (NTG) is an eye disease, a neuropathy of the optic nerve, that shows all the characteristics of primary open angle 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 ...
For most individuals, the normal range of intraocular pressure is between 10 mmHg and 21 mmHg. [3] It is estimated that approximately 2-3% of people aged 52-89 years old have ocular hypertension of 25 mmHg and higher, and 3.5% of people 49 years and older have ocular hypertension of 21 mmHg and higher.
Normal-tension glaucoma, which comprises 30-90% of primary open-angle glaucoma (depending on ethnic group), [24] is also associated with genetic mutations (including OPA1 and OPTN genes). [ 32 ] Additionally, some rare genetic conditions increase the risk of glaucoma, such as Axenfeld-Rieger syndrome and primary congenital glaucoma , which is ...
(H40.2) Primary angle-closure glaucoma (H40.3) Primary Normal tension glaucoma; H43-H45 Disorders of vitreous body and globe ... EyeWiki: The Eye Encyclopedia written ...
The diurnal variation for normal eyes is between 3 and 6 mmHg and the variation may increase in glaucomatous eyes. During the night, intraocular pressure may not decrease [17] despite the slower production of aqueous humour. [18] Glaucoma patients' 24-hour IOP profiles may differ from those of healthy individuals. [19]
It is an important test in the evaluation of patients at risk from glaucoma. [1] Most tonometers are calibrated to measure pressure in millimeters of mercury ( mmHg ), with the normal eye pressure range between 10 and 21 mmHg (13–28 hPa).