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Ophthalmology. Ocular hypertension is the presence of elevated fluid pressure inside the eye ( intraocular pressure ), usually with no optic nerve damage or visual field loss. [1] [2] For most individuals, the normal range of intraocular pressure is between 10 mmHg and 21 mmHg.
The main cause of damage to the optic nerve is intraocular pressure (IOP), excessive fluid pressure within the eye, which can be caused by factors such as blockage of drainage ducts and narrowing or closure of the angle between the iris and cornea.
Intraocular pressure may become elevated due to anatomical problems, inflammation of the eye, genetic factors, or as a side-effect from medication. Intraocular pressure laws follow fundamentally from physics. Any kinds of intraocular surgery should be done by considering the intraocular pressure fluctuation.
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.
In many people with glaucoma, the cause of the disease is perfusion issues of the optic nerve and retina, while intraocular pressure is normal. Many patients with normal tension glaucoma have a basic constitution, which corresponds to the Flammer syndrome.
Idiopathic intracranial hypertension ( IIH ), previously known as pseudotumor cerebri and benign intracranial hypertension, is a condition characterized by increased intracranial pressure (pressure around the brain) without a detectable cause. [2] The main symptoms are headache, vision problems, ringing in the ears, and shoulder pain.
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