Font Size
A
A
A
1
...

Normal-Tension Glaucoma

Normal-Tension Glaucoma Overview

Glaucoma is usually high pressure inside the eye that damages the optic nerve and can result in permanent vision loss. Normal-tension glaucoma (also called low-tension glaucoma) is a unique condition in which optic nerve damage and vision loss have occurred despite a normal pressure inside the eye.

Eye pressure, called intraocular pressure (IOP), is measured in millimeters of mercury (mm Hg). Normal eye pressure ranges from 10-21 mm Hg. Most people with glaucoma have IOP of greater than 21 mm Hg; however, in normal-tension glaucoma, people have IOP within the normal range.

By definition, people with normal-tension glaucoma have open, normal-appearing angles. In fact, the features of normal-tension glaucoma are similar to primary open-angle glaucoma (POAG), the most common form of glaucoma (see Primary Open-Angle Glaucoma).

  • Although the occurrence of normal-tension glaucoma varies worldwide, it is very prevalent in Japan.
  • In the United States, up to 15-25% of people with open-angle glaucoma experience normal-tension glaucoma.
  • According to the Baltimore Eye Study, 50% of individuals with changes in their optic disc (the front surface of the optic nerve) and in their visual field had an IOP of less than 21 mm Hg on a single visit, and 33% had an IOP of less than 21 mm Hg on 2 measurements.
  • Normal-tension glaucoma is more common in women than in men.
  • Normal-tension glaucoma affects adults, with an average age of 60 years.
Medically Reviewed by a Doctor on 7/25/2014
Medical Author:
Coauthor:
Medical Editor:
Medical Editor:
Medical Editor:

Must Read Articles Related to Normal-Tension Glaucoma

Adult Glaucoma Suspect
Adult Glaucoma Suspect Glaucoma is usually high pressure inside the eye that damages the optic nerve and can result in permanent vision loss. Not all 3 criteria (that is, high pressur...learn more >>
Glaucoma FAQs
Glaucoma FAQs Glaucoma is usually high pressure inside the eye that damages the optic nerve and can result in permanent vision loss.learn more >>
Glaucoma
Glaucoma Overview Glaucoma refers to certain eye diseases that affect the optic nerve and cause vision loss. Most, but not all, of these diseases typically produce elevated press...learn more >>


NIH talks about Ebola on WebMD

Read What Your Physician is Reading on Medscape

Glaucoma, Low Tension »

Low-tension glaucoma (LTG) is a chronic optic neuropathy that affects adults.

Read More on Medscape Reference »


Medical Dictionary