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Feb 5, 2019

What is Normal-Tension Glaucoma?

What is Normal-Tension Glaucoma?

Primary open-angle glaucoma, the most common form of glaucoma, develops slowly and has symptoms that often go unnoticed. Raised IOP is a hallmark of most forms on glaucoma. However, in certain conditions, optic nerve damage may occur even when the IOP is below the normal level of 21 mm Hg. This form of glaucoma is commonly referred to as normal-tension glaucoma (NTG).

NTG is associated with glaucomatous optic nerve damage, progressive thinning of the retinal nerve fiber, and visual field defects.


What are the risk factors for normal tension glaucoma?
Some factors that predispose persons to increased risk of developing NTG are

Family history of NTG – The TANK-binding kinase 1 gene has been found to be associated with NTG development.
Japanese ancestry –The condition occurs most commonly among Japanese persons.
Persons with a history of heart disease such as irregular heart rhythm, vascular dysfunction and ischemia.
Female patients – The condition is more prevalent in females than male.
Persons with hypertension and impaired glucose tolerance.


How is normal-tension glaucoma diagnosed?

Medical history

A complete medical history is taken with special emphasis on history of head injury. Past episodes of migraine, shock, neurological symptoms, and Raynaud’s phenomenon are also investigated.

The doctor may also inquire regarding the use of medications such as systemic steroids and beta blockers.

Visualizing the optic nerve damage…….

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Source: News Medical


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